Editor's Note:

It seems that the frosty China-Australia relations have started to thaw faster. After three years, the bilateral high-level dialogue has resumed and Australian Prime Minister Anthony Albanese has announced a visit to China later this year. However, the relationship between the two countries is still clouded by several factors, Washington's constant pursuit of containing China and the security pact AUKUS, announced two years ago this week, among others. In a conversation with Global Times (GT) reporter Xia Wenxin, Joseph Camilleri (Camilleri), Emeritus Professor at La Trobe University in Melbourne and a Fellow of the Australian Academy of Social Sciences, shared his views on issues including China-Australia ties and the development of AUKUS.

GT: On September 15, 2021, the US, Australia and the UK announced a new security pact called AUKUS. After the establishment of this partnership, you commented that the agreement was "a story of recklessness and delusion." Now two years later, how do you see the development of AUKUS?

Camilleri: AUKUS has affected Australia's situation, and is a source of tension. What is unfortunate about AUKUS, in my view, is the impact it has on Australia. Much of this is about future "defense" planning. There are various forms of military cooperation between the US and Australia which have become closer and closer. AUKUS has simply given them another boost.

I called it a story of "recklessness and delusion" because it places Australian assets, resources and the country as a whole in a military relationship with the US, over which it has only limited control. And this tends to exacerbate its relations with other countries, China, of course, but also many other countries, especially in Southeast Asia. I am quite concerned about what this might mean for the future - in particular, whether it might lead to some kind of arms race in the Asia-Pacific region.

GT: Has AUKUS become an obstacle to China-Australia relations? How will this partnership affect the development of the relationship in the future?

Camilleri: It's just one more obstacle on top of the other obstacles. To find out what lies behind AUKUS and much else that goes hand in hand with the Australia-US military alliance, China, its people and its government cannot but ask the following questions: Are these arrangements aimed at China? What is the purpose of these arrangements? Why is the US so keen to have these kinds of provocative security relationships in the Asia-Pacific?

The US is keen to maintain its dominance in the Asia-Pacific region, where it has projected military far beyond its boundaries virtually unchallenged since the end of World War II. It is concerned that China's rise may pose a threat to its dominant position.

What the US wants to do in Asia-Pacific is to build as many security relationships as it can and make its military planning and weapons systems as closely interconnected as possible with the military establishments of its allies and partners. It sees this strategy as crucial to bolstering its position in the Asia-Pacific region. 

The US is presently intent on constructing an overwhelming military presence in both the Indian and Pacific Oceans. AUKUS is but one prong in this strategy. 

That is the problem we're facing: We have a major power that has been since World War II a superpower and the dominant power in the world, and it wants to preserve its dominance at all costs. But there are other countries, most notable China, that are rising and are committed to notions of multipolarity. Here you have a dangerous tension. And Australia, unfortunately, has been caught in the middle of these conflicting views as to what the future should look like.

GT: While Pillar 1 seems to face various difficulties, AUKUS has announced an ambitious Pillar 2 with the hope that more countries will join. What do you think is the motive of AUKUS countries behind such a move? And how likely is it that more countries will participate in the program in the future?

Camilleri: The intention of Pillar 2 has more to do with how these three countries - Australia, the US and the UK - will extend their cooperation beyond the nuclear power submarines and whether they will involve other types of defense capabilities, including artificial intelligence, quantum technologies, among others. That's one part of Pillar 2, one part of expanding the strategic military relationship. 

The other part is to bring other US allies into practical forms of military cooperation. Several have been mentioned: hypersonics, cyber security and anti-submarine warfare, the emphasis being on operational and practical cooperation.

I don't see too many countries being terribly enthusiastic about joining Pillar 2 - maybe Japan or South Korea, but even their joining is not exactly guaranteed, nor is it clear what form it will take. However, the underlying idea is clear: it is to build the political, diplomatic and military infrastructure that will enable the US to maintain dominance in the region. That's the name of the game. It may create problems in the short to medium term. We need to be concerned about these looming dangers. 

GT: In addition to AUKUS, Australia and the US have deepened their military partnership. For instance, Washington has made a commitment to help Australia produce guided multiple-launch rocket systems by 2025. What do you think of this "help" from the US? How will it affect Australia? 

Camilleri: The defense links between the two countries, including the AUKUS arrangement, will probably deepen as there is an increasing level of interoperability. From the point of view of the US military establishment, what Australia offers is real estate assets, that is to say, it can operate from different parts of the Australian continent which provides it not just with landing and refueling rights but also with platforms from which it can operate its land, sea and air forces.

And I suppose for the Australian military, the US offers a few "carrots." It supplies Australia with more advanced technology and perhaps some increased intelligence cooperation. This is just one part of the wider picture that I described before. The US is, in some respects, a declining power, and therefore needs to boost its position by relying on what its allies and security partners can provide. This is why there is so much emphasis, particularly under the Biden administration, on developing, maintaining and strengthening military alliance arrangements on the European front as well as in the Asia-Pacific.

Australia is becoming more and more enmeshed and integrated into US military planning. Against this backdrop, many Australians are challenging and questioning the current direction of Australian defense policy, even many within the Labor Party, the party in government. 

I expect there will be an ongoing debate within Australia for some time to come. The wider questions of Australia's place in the region and the world will become a major subject of public discussion for some time to come.

GT: A recent article in The Economist suggests that if a war were to break out with China, Australia seems most willing to fight alongside the US. Do you agree? Is such an argument wishful thinking only on the US' part?

Camilleri: I don't think these opinions carry a great deal of rational weight. Some years ago, a previous Liberal foreign minister made it clear that there is no commitment under the ANZUS alliance for Australia to join the US in a war against China, for example, in relation to Taiwan.

Australia would think many times before it became involved in such a conflict. But there is always a danger that this may happen. This danger needs to be taken seriously. The challenge, as I see it, is not what would happen in the event of a China-US war. The issue that we must all confront is: how do we make sure such a war never takes place? There's too much talk in Australia and elsewhere, even by those who oppose AUKUS, about what should not happen, and not enough about what should happen. 

We need to think about what alternatives look like, and the alternative is to try and build a regional framework in which all countries in Asia-Pacific, large and small, powerful and not so powerful, can coexist in relative peace. That's what Australia, among others, should be committed to.

GT: How do you see the role of the US in China-Australia relations? Some argue that structural conflicts in the China-US relationship constrain China-Australia ties. Do you share this view?

Camilleri: We've been discussing a major conflict that has emerged in recent times. At the moment, the conflict between China and the US is largely geopolitical, not military. This is something that the entire international community must be concerned about. We have to find ways whereby China and the US can live in peace with each other. It's critical for the future of both countries as well as the world. We cannot allow the present tensions to keep rising.

The US administration, in particular the US security establishment, has never fully consulted the American people as to how they should plan the future of the country's foreign and security policy. The American people have never been consulted and have never had the opportunity to participate in a serious public discussion of these issues. The same is true of Australia.

As we have seen, there is an emerging structural conflict. It is something we must all work to prevent and diffuse as best we can, and Australia should be playing its part. Unfortunately, it is not doing very well. So must other regional powers and, of course, the great powers, including the US and China.

GT: On September 7, China and Australia held their first high-level dialogue in three years. What kind of signals do you think this event has released? Does it lay the foundation for further easing in China-Australia relations? What suggestions do you have for the Australian government to improve its relations with China?

Camilleri: There are some positive signs. These are rather early signs which haven't yet gone very far. Part of the challenge we face is to identify the good things Australia and China could be doing together that they're not doing at present. It's very important that we put this question on the table in high-level dialogues. Also, in future discussions, Chinese and Australian government leaders must address the question, what are the good things that our two countries could be doing but are not presently doing? Two things stand out.

First, there is a great opportunity to develop the bilateral relationship. What we ought to place at the forefront of the relationship is not "strategic competition." Far more important is a better cultural understanding of each other. For Australia, this means a wide-ranging program with China's engagement to develop a better understanding of Chinese culture, history, civilization, language and, perhaps most importantly, Chinese perspectives on the emerging, rapidly transforming world order. Hopefully, the same question is being addressed in China, which is far bigger and more influential than Australia.

Ultimately, what matters most is people-to-people contacts and connections. Therefore, at the center of Australia-China discussions should be this question: What should we do to develop people-to-people relations between these two countries on a large scale? Such culturally based understanding and cooperation can greatly assist the bilateral relationship, in particular, mutually beneficial economic development, not least in trade, investment, and technological cooperation. 

The second thing has to do with multilateral relations. Australia and China should discuss seriously at the highest level what initiatives the two countries can take to advance the prospects for disarmament and demilitarization in our region. With the loosening and demotion of military alliances and appropriate diplomatic steps, we can work towards more effective forms of both regional and global governance. China and Australia should work together toward achieving urgently needed reform of the United Nations and greater regional cooperation on many fronts, including an economically and environmentally constructive code of conduct for the South China Sea. There is so much positive work that could be done. The time has come to do it, and do it with a renewed sense of urgency.

China's Shenzhou-14 crew, who have stayed at China's space station for half a year, have completed all the assigned tasks and will return to Earth in the coming days, the Global Times learned from the Jiuquan Satellite Launch Center in Northwest China's Gansu Province on Friday.

The Shenzhou-14 spacecraft will land at night at the Dongfeng landing site in the Gobi Desert, North China's Inner Mongolia Autonomous Region, the Global Times learned. The site conducted the last full-system integrated exercise for its search and rescue mission on Thursday.

The drill on Thursday further tested the site's organizational and implementation capabilities for spacecraft search and rescue missions. Currently, all special working groups at the landing site are ready to receive the return of Shenzhou-14.

Shenzhou-14 is the last mission of the three-step development strategy of China's manned space project, as well as the final episode of the construction stage of the China Space Station.

The fact that they will return at night time involves higher requirements for on-site rescue and risk prevention, the Global Times learned, as it would be more difficult to locate and reach the ship at night.

To prepare for the successful completion of the return, the landing site worked on a situation with the maximum of hardship, complexity, coldness and darkness, and made various plans for spacecraft tracking, return capsule recovery, and on-site rescue for astronauts.

A number of materials have been prepared including lighting and winter supplies. Training for extreme situations has also been carried out to ensure they can handle any kind of emergency during the process.

Early on Wednesday morning, six taikonauts of the Shenzhou-14 and -15 missions had their historic gathering in the China Space Station, marking a first in China's aerospace history, after the Shenzhou-15 manned spacecraft was launched on Tuesday night.

The new faces of Shenzhou-15 will conduct a direct handover in orbit with their predecessors, which will take about five days, during which the Shenzhou-14 crew members will mainly prepare for their return to Earth, while the Shenzhou-15 crew will focus on setting up the space station's working status, adapting to the space environment and concluding the handover.

Sitting atop a Long March-2F Y14 carrier rocket and carrying Chen Dong, Liu Yang and Cai Xuzhe - the third crew to enter China's Tianhe space station core module - Shenzhou-14 was launched on June 5 from the Jiuquan Satellite Launch Center.

Six months later, the Shenzhou-14 members have achieved a number of firsts, including the first in-orbit docking of two 20-ton space modules, the first time taikonauts entered the Wentian and Mengtian lab modules, and the first two-hour fast autonomous docking of a cargo spaceship.

According to Ji Qiming, spokesperson for the China Manned Space Agency, they have completed a variety of tasks. The crew coordinated with the ground to finish building the basic structure of the T-shaped space station. They have also undergone nine combo configurations, five rendezvous and docking maneuvers, two separations, and two translocation missions.

The Shenzhou-14 crew have also managed a large number of platform tests, as well as equipment maintenance and other tasks onboard the space station. They completed the unlocking and installation of experiment cabinets in two lab modules, and carried out a number of scientific and technical experiments as well as one "Tiangong classroom" space lecture.

Together with other nine departments, the National Health Commission (NHC) has launched a one-year campaign to crack down on corruption in the healthcare sector across the country, focusing on "key few" and key positions in the pharmaceutical industry to ensure high-quality development of the medical and healthcare sector, the NHC announced on Tuesday.

Since China started the sweeping anti-corruption drive in the public health sector in mid-July, at least 176 Party secretaries or heads of hospitals had been put under investigation as of Saturday, according to media estimates.

Strengthening the anti-corruption work in the healthcare field is an important content of promoting the high-quality development of the pharmaceutical industry, and an important part of improving the construction of the pharmaceutical governance system.

In recent years, some people in key positions have been guilty of accepting kickbacks, bribery and profiteering, among other crimes, thereby seriously diluting the dividends gained from the reform and development of the pharmaceutical industry and eroding the rights and interests of the people. This not only hinders the reform and development of medical, insurance and pharmaceutical undertakings, but also jeopardizes the interests of the vast majority of people in the field of medicine and health, the NHC said on Tuesday.

The one-year campaign covers the entire chain of production, circulation, sales, use and reimbursement in the pharmaceutical industry, as well as pharmaceutical administrative departments, industry associations, medical and health institutions, pharmaceutical production and operation enterprises, and medical insurance funds, according to the NHC.

This concentrated campaign will focus on six aspects: administrative departments in the field of medicine using power for profiteering; the "key few" and major key positions in medical and health institutions; sales representatives for drugs, equipment, and consumables; social organizations that accept the management and guidance of administrative departments that use their position for self benefit; illegal acts by pharmaceutical enterprises during purchases and sales; and medical staff in violation of the standards for integrity, the NHC said.

Recently, some media outlets have reported on the suspension and postponement of some academic conferences due to the anti-corruption campaign. However, the NHC responded that what needs to be remedied is the illegal behavior of fabricating academic conferences out of thin air, carrying out illegal benefits transmission, or illegally sharing the sponsorship fees of academic conferences.

Medical experts said that the anti-corruption campaign in the sector this year is different from previous campaigns, as it is sweeping and more vigorous than ever.

Corruption in the medical sector is a serious issue that affects the credibility of the healthcare system and the interest of patients, said Zhong Chongming, an expert from the China Health Culture Association.

As the medical anti-corruption campaign has received widespread attention, some social platforms have exposed several corruption cases. In one case, Xu Bo, the director of the cardiac catheterization room at Fuwai Hospital, the Chinese Academy of Medical Sciences, was investigated by the discipline inspection team of the Central Commission for Discipline Inspection and the NHC of the State Supervisory Commission for suspected serious violations of discipline and law. At present, the case is still under investigation.

After confirming with related departments, the NHC said that online rumors about Xu using the opportunity of surgeries, consumables, and participation in the procurement of medical equipment bidding to accept bribes of up to 1.2 billion yuan ($165.6 million) are seriously inconsistent with the current investigation of the case.

The notoriously intricate strategy game Go has a new champion.

AlphaGo, Google’s Go-playing computer program, has topped Lee Sedol, the world’s reigning player, in a five-game match played over a week in South Korea.

The program, a breakthrough in artificial intelligence, learned to play Go by watching human experts and by playing millions of games against itself. It stepped into the world spotlight in January, when it beat Fan Hui, the European champion, 5 games to 0. Victory wasn’t certain against Sedol, though, a player often described as “legendary.”

But by March 12, Sedol was officially sunk. AlphaGo had defeated the human in three consecutive games. The only question left was whether the program would sweep the match. In game 4, however, Sedol defied expectations and pulled out a win. In game 5, AlphaGo made a big mistake early on, but clawed its way back in a match that Google DeepMind’s Demis Hassabis tweeted was “nail-biting.”

Google DeepMind, the artificial intelligence company that developed AlphaGo, will give away the $1 million in prize money, splitting it amongst UNICEF, science, technology, engineering and math charities, and Go organizations.

Tadpoles don’t cry to get their way. But some of them sure can beg.

Each bout of hungry-baby drama among mimic poison frogs (Ranitomeya imitator) occupies both parents for hours. The tadpoles get so crazy-frantic that researchers wanted to know whether the begging is an honest call for help or a histrionic scam.

Frogs can lay globs of eggs by the thousands and leave them to fend for themselves. But the two-to three-egg clutches of mimic poison frogs (the only known monogamous frogs) get coddled, says Kyle Summers of East Carolina University in Greenville, N.C. Dad repeatedly checks in, sitting on the eggs and shedding some paternal pee if they’re drying out.
When the eggs hatch, dad gives each tadpole a piggyback ride to its own private pool. To find a little rainfall cupped between a leaf and stem, he’ll haul youngsters four meters or so. “A bit of a hike,” Summers says, since dad is only about a centimeter or two long himself.

These baby pools are pretty empty: home to only some algae, maybe some small insects. “The good news is that your offspring are not likely to get eaten; the bad side is that they don’t have anything to eat,” Summers says.
This is where the begging comes in. Frogs can’t make milk like mammals or regurgitate bugs like birds. But this species is one of the rare frogs whose moms, after considerable persuading, will lay an unfertilized egg for the tadpoles’ breakfast.
When parents show up on their weekly visit, a youngster stops regular swimming, noses up to a parent and goes into a frenzy of vibrating its tail. “The parent cannot miss a hungry tadpole,” Summers says.

Bouts of persuasion go on for several hours as the tadpole begs, stops, begs more and then more. Mom often makes several false starts, entering the pool but leaving it without any egg action. During all this, “dad will be the cheerleader,” calling in trills and stroking her, Summers says.

Analyzing tadpole frenzies in the lab, Summers’ then-student Miho Yoshioka found that tadpoles on short rations begged more as hungry weeks dragged on. Parents fed these hungrier tadpoles more reliably than the babies that researchers slipped treats to, Yoshioka, Summers and Casey Meeks report in the March Animal Behaviour. Overall, the researchers conclude, the relentless frenzy shows honest need, not tadpole greed.

Smartphone-toting pilgrims regularly stream into northern Cambodia from all over the world. Their destination: Angkor Wat, a medieval temple that’s famous for massive towers and majestic stone carvings of Hindu gods, spirits and mythological battle scenes. The site, considered the world’s largest religious monument, drew more than 2.3 million visitors in 2014.

Angkor Wat’s sightseers encounter a study in contrasts. This architectural wonder of human civilization ascends skyward, on the verge of being engulfed by nature below. Tourists walk along a path that crosses over a moat and through the temple’s western side, the one entrance cleared of vegetation. Lush forest stops just short of the rest of the structure. Outside the moat, trees, thick ground cover and ponds dominate the landscape.
While adventurous visitors snap pictures, scientists are using high-tech approaches to uncover Angkor Wat’s hidden side, long obscured by all that vegetation. After more than a century of research on the parts of Angkor Wat that are visible with the naked eye, many scientists assumed that the site was a sacred city contained within the bounds of a square moat. But even though its name roughly translates as “temple city,” new finds show that Angkor Wat was not a sacred city at all. It was a gigantic temple connected to residential districts, canals and other structures that stretched beyond the moat and blended into a sprawling city called Greater Angkor, which covered about the same area as Berlin or Columbus, Ohio.
Angkor Wat’s unveiling by modern laser technology began in April 2012. Archaeologist Damian Evans of Cambodia’s Siem Reap Center and several colleagues made daily helicopter flights for almost two weeks over a 370-square-kilometer area around the temple. The helicopter carried $250,000 worth of special equipment that fired millions of laser pulses every few seconds at the forest below. A small percentage of those pulses zipped in between trees and foliage to the forest floor. The Earth’s hard surface bounced those laser shots back to a sensor on the helicopter. This technique, known as light detection and ranging, or lidar for short, picked up differences in the contours of the land now obscured by jungle. With the findings, researchers could draw a picture of city blocks, residential areas, dried-out ponds and other archaeological remains. Results gleaned from lidar and from new ground-based investigations appeared in the December 2015 Antiquity.

Lidar has been around since the early 1960s. Scientists have used it to measure pollutants in the atmosphere, map shorelines and guide robotic and manned vehicles around obstacles. Lower costs over the last decade have made the technology accessible to archaeologists.

With their laser eye in the sky, Evans and colleagues uncovered big surprises at Angkor Wat. Just beyond one side of the roughly 1.3-kilometer-square moat surrounding the temple, the researchers found six massive and mysterious lines of earth arranged in precise coils — as well as adjacent areas where later canal construction had apparently destroyed two more coiled mounds. These Khmer creations resemble the spiraling paths of labyrinths. Lidar-guided excavations within the moat’s boundary upended ideas about who lived on temple grounds. Rather than religious or political bigwigs, residents were workers who kept the place running. And on-the-ground research found evidence of unexplained towers, built and then demolished during Angkor Wat’s construction, as well as defensive platforms used, perhaps, to fight off invaders.
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“It’s an embarrassingly exciting time for archaeologists who study Angkor Wat,” says University of Sydney archaeologist Roland Fletcher. “Researchers have driven and walked over many of these new discoveries for a century.” Fletcher directs the Greater Angkor Project, which combines remote sensing technology with archaeological digs.

If Angkor Wat blended into Greater Angkor’s 1,000 square kilometers of urban sprawl, so did hundreds of other temples and shrines of lesser grandeur built by rulers of Southeast Asia’s Khmer Empire from the ninth to 15th centuries, he says.

“There was nothing like Greater Angkor until the advent of 19th century industrial cities,” says Fletcher, who estimates it held about 750,000 residents in the 12th and 13th centuries. Cities of around 1 million people arose in China by the ninth century, but those metropolises covered one-half or less the area of Greater Angkor. Spread-out cities in the mold of Greater Angkor became more common in the 1800s as trains and cars made long-distance travel easier. But discoveries at Greater Angkor shatter a long-standing assumption that urban sprawl was impossible without mechanical forms of transportation, he says.
City sprawl
Lidar technology revealed new structures in and around the Angkor Wat temple complex.
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Big grids
Carved inscriptions at Angkor Wat describe the structure as the pet project of Suryavarman II, who ruled the Khmer Empire from 1113 until his death in 1149. Serving first as a temple dedicated to the Hindu god Vishnu, Angkor Wat also became a mausoleum for Suryavarman II when he died.

The temple hosted Hindu ceremonies into the 13th century. In the 14th or 15th century, it became a Buddhist temple. Like tourists and scientists, Angkor Wat’s modern-day Buddhist monks had no idea that the site was once so extensive.

Lidar revealed a grid of pathways forming four rectangular blocks, each the size of a small town, that encircle the main temple inside the moat. Earthen mounds and an estimated 250 to 300 ponds — now dried-out depressions on the forest floor — dotted these gridded areas.

Excavations in 2010 and 2013, the latter guided by lidar findings, uncovered remains of modest wooden dwellings and household goods, such as pots and a ceramic cooking device, in the mounds. Archaeologist Miriam Stark of the University of Hawaii at Manoa in Honolulu led that work.

Radiocarbon dating conducted by Stark’s team indicates that houses situated around the ponds appeared at least as early as the sixth century near the eventual site of Angkor Wat. Other residences date to after the 15th century, supporting evidence — including a 17th century Japanese map of the Angkor Wat temple — of the structure becoming a Buddhist religious center.
No more than 4,500 people lived within Angkor Wat’s moated boundary in the 12th century, Fletcher estimates. His calculation is based on the account of a 13th century Chinese emissary to Greater Angkor, who wrote that one to three families shared each pond in the area around the tample.

Stone inscriptions at nearby Ta Prohm, a late–12th century Greater Angkor temple, record a workforce of 12,640 people that included only about 2,000 on-site residents. Another 66,625 people were described as being “in service” to the temple, delivering food and other supplies.

At roughly twice the size of Ta Prohm, Angkor Wat probably relied on a workforce of about 25,000, Fletcher suspects. An additional 125,000 people must have shuttled in supplies. Each Greater Angkor temple apparently supported a vast economy.

If that’s true, it makes sense that crisscrossing roads forming residential blocks fan out far beyond Angkor Wat’s moat on the 2012 lidar map. “Urban grids stretched beyond temple walls into the hinterlands,” Evans says.

Lidar data showed a comparable street network at a nearby 12th century temple, Angkor Thom. Here too, “to our complete surprise, the layout of houses and streets continues beyond the moated confines of the temple,” says archaeologist Charles Higham of the University of Otago in New Zealand. He studies Greater Angkor and is familiar with the lidar results.

Religious and political big shots lived somewhere in the urban sprawl outside Angkor Wat and other temples, Fletcher suspects. Why they did so is unclear.

Mystery coils
Finding that Angkor Wat extended far beyond its moat was unexpected. But a discovery just south of the temple’s moat was unprecedented.

Lidar unveiled long banks of earth that formed six well-preserved coiled or spiral-shaped patterns. Each formation is roughly 1 kilometer long and 0.5 kilometers wide, or about 10 times the length and width of a football field. The precise alignment of these earthworks with the moat suggests they were assembled around the time of Angkor Wat’s construction.
A ground survey in late 2012 and early 2013 determined that the coils consisted of 18-meter-wide sandbanks separated by 12-meter-wide channels. After using laser maps to locate the spirals on the ground, investigators walked through the channels searching for signs of human activity. They found no pottery or other artifacts to suggest that anyone had lived or worked there.

“Nothing like the shape and design of these spirals has been seen anywhere else,” Fletcher says.

Suryavarman II’s reasons for building the coils are unknown. These mounds might have served as raised fields for growing herbs used in temple rituals. Or the coils might have been sites of formal gardens that would have been unrivaled in size and complexity until the construction of 18th century palace gardens in Europe, Evans suggests.

Rainwater could have flowed through channels between the coils. Evans doubts, however, that enough water collected to support farming.

It’s also possible that Angkor Wat’s spiral structures held special spiritual meaning for Khmer people and had no practical use. Yet Fletcher says that nothing resembling these coiled forms appears in Hindu writings and art.
After what must have been several decades of construction coinciding with work on the temple, “the spirals may never have been completed and might never have become operational,” Evans says.

Researchers are now examining fossilized pollen recovered from the coils for signs of cultivation or gardening.

Buried towers
Another surprising discovery at Angkor Wat comes not from lidar but from ground-penetrating radar. While lidar reveals characteristics of the ground’s surface covered by vegetation, ground-penetrating radar can detect objects buried deep under several dozen meters or more of soil.

In December 2009, a team led by archaeologist Till Sonnemann of Leiden University in the Netherlands dragged a wheeled device reminiscent of a lawn mower over Angkor Wat’s vast outer section for two weeks. High-frequency radio waves emitted by the contraption bounced off buried objects, signaling locations of possible archaeological remains.

Sonnemann was looking for remnants of houses or administrative buildings from the 12th century or later. Something far more intriguing turned up.

At Angkor Wat’s western entrance, where visitors enter the grounds of the temple, the radar machine identified what looked like the foundations of eight towers. Excavations in 2010 and 2012 confirmed their existence. Foundation remains lie roughly 21 meters belowground, about 10 times as deep as an Olympic swimming pool.

Each cross-shaped foundation, held in place by walls made of a reddish rock called laterite, had a square central section bound by porches jutting out on each side. Intact shrine towers from other Khmer Empire sites, which were dedicated to various gods, feature side porches.

Angkor Wat’s former towers were intentionally destroyed, Sonnemann says. Radiocarbon dating of burned wood from the foundations suggests the towers were built around the time that work started on Angkor Wat. Demolition occurred when Angkor Wat’s outer wall and western gate were completed, Sonnemann suspects.

Perhaps 12th century residents of Greater Angkor used the gateway towers as a temporary religious shrine to the Hindu god Vishnu while erecting Suryavarman II’s temple, which was dedicated to the same deity, Sonnemann says. Of the eight towers, four formed a square that stood within a larger square formed by the four others. Angkor Wat itself features four towers arranged in a square around a central tower.

The gateway towers may have served as an outline of Angkor Wat’s permanent towers, Sonnemann speculates. But they were not identical. Remote sensing identified no remnants of a central tower at the western entrance.
Wall defenses
Tourists and researchers have long gazed at Angkor Wat’s impressive stone outer wall without realizing it holds clues to warfare between the Khmer Empire and regional foes, says archaeologist David Brotherson of the University of Sydney.

Archaeologist Christophe Pottier of the Bangkok Center in Thailand first noticed holes that had been intentionally carved in parts of the wall constructed later. When Brotherson took a closer look, he speculated that those openings once supported wooden platforms and fences.

Angkor Wat’s defenders stood on the platforms and positioned themselves between the fences to repel attacks by nearby Thai kingdoms, Brotherson proposes. Those confrontations probably took place sometime between the late 13th and early 17th centuries.

Brotherson studied 6,257 wall cavities. Most consist of groups of seven square holes, at the same height, running across the inside of the wall near its top. Sets of holes, notches and grooves also run across adjacent areas on top of the wall.
These alterations appear at spots where six nearly 20-meter-wide gaps in the wall — which probably framed wooden gates — were later filled in with stone blocks. Differences in detailing and finish distinguish original masonry from filled-in sections.

Holes on the inner part of the wall held wooden beams that supported platforms about 3.5 to 4 meters above the ground that must have had stairs at each end, Brotherson says. Angkor Wat’s fighters would have stood on platforms while raining down arrows or other weapons on attackers. Wall-top holes probably held fence posts for additional protection, he suspects. Yet researchers have found no arrowheads or other weapons and no evidence of military damage to Angkor Wat, such as wall marks from catapulted boulders or remnants of torched wooden buildings.

Still, it’s more likely that the wall’s inside holes held platforms for temple defenders to stand on than wooden roofs that sheltered people or animals underneath, Brotherson says. Gateway spaces would not have been filled in simply to construct shelter roofs, he contends. And roofs would not have required holes carved on top of the wall.

“There are no historical references to defensive fortifications at Angkor Wat,” Fletcher says. “Sometimes archaeology tells us things that history cannot.”

Tropical trajectories
Lidar’s bird’s-eye view of forest floors has guided archaeologists not only to lost parts of Angkor Wat, but to a greater appreciation of similarities between Greater Angkor and other ancient tropical cities.

Lidar surveys of west-central Belize in 2009 and 2013 showed that the ancient Maya city of Caracol sprawled across now-forested landscape much as Greater Angkor did. A dense urban area, incorporating agricultural fields into a planned city, spread 10 kilometers in all directions from central Caracol in 650. Researchers estimate that more than 140,000 people lived at Caracol (SN: 12/15/12, p. 14).

Laser maps revealed farming terraces, housing tracts and roads leading to public plazas that ranged far beyond Caracol’s urban center. Anthropologists Arlen and Diane Chase of the University of Central Florida in Orlando directed lidar research at Caracol.

At 1,000 square kilometers, Greater Angkor covered a much larger area than Caracol. “Lidar surveying has just begun, but we now know that Maya cities were shrimps compared with mighty Angkor,” says Yale University anthropologist Michael Coe, a long-time investigator of the Maya and other ancient American civilizations.
Nothing like Angkor’s street grids stretching with geometric precision toward the horizon appears at Caracol, adds Coe, who is familiar with work at both sites.

Still, common factors inspired the rise and fall of Greater Angkor, Maya urban centers such as Caracol and the tropical city of Anuradhapura in Sri Lanka between the ninth and 16th centuries, Fletcher and two colleagues concluded in the October 2015 Antiquity.

Rulers in each region directed the construction of reservoirs and canals that allowed spread-out cities to flourish. Effective water management cemented the power of kings by enabling masses of farmers to make a steady living.

Severe periods of drought, indicated by analyses of tree rings and lake sediments, strained water supplies in each tropical setting, Fletcher says. Periodic monsoon rains in Southeast Asia and Sri Lanka added insult to injury, overwhelming reservoirs and damaging canals.

Unable to supply enough water, political systems at Greater Angkor and other tropical cities crumbled, Fletcher argues. But societies didn’t vanish. Farmers reorganized into smaller communities based near coasts and along major rivers. Cultivation continued in fields that had once been part of massive cities.

Laser quest
Fletcher’s rise-and-disperse scenario for ancient tropical cities is being put to a broader test. From March to May 2015, a second set of lidar flights expanded laser mapping of northern Cambodia to a total area of 2,000 square kilometers. Researchers want to see if, like Angkor Wat, other ancient temples in the region sat in the center of dispersed settlements tied together by reservoirs, canals and ponds. Archaeological investigations based on the new lidar data are under way. Evans plans to announce initial findings in June.

Over the next 10 to 15 years, lidar technology will become smaller and cheaper, Evans predicts. Laser-wielding drones will replace lidar-toting helicopters. But laser mapping is already a game changer for tropical archaeology.

Around Angkor, “the impact of lidar data is like turning on a light after groping in the dark for over a century,” says archaeologist John Miksic of the National University of Singapore.

Suryavarman II, a politically ambitious warrior who tried to expand his kingdom by launching wars and allying himself with Imperial China, would surely celebrate Angkor Wat’s laser revival if he was around today. It’s a revival of sorts for the once-mighty king, as well.

Venus flytraps (Dionaea muscipula) make carnivory look cool. But the genes that make it possible have roots in herbivory.

Though modern flytraps eat insects, their ancestors probably didn’t. In search of clues to this transition, Rainer Hedrich of the University of Wurzburg in Germany and his colleagues looked at protein production patterns in in different parts of the plant.

Unstimulated traps seem to decode genes for similar proteins to those found in leaves, which supports the theory that traps originally evolved from foliage. Glands inside the trap, which help with digestion, share common gene expression patterns with roots — perhaps because both process nutrients.

Sensory hairs signal traps to close on prey. When an unsuspecting spider trips those trap hairs, gene expression patterns shift dramatically. Traps start producing signaling hormones and digestive enzymes. Some of these same protein pathways also help plants heal wounds inflicted by herbivores. Venus flytraps may have rewired traditional plant defense machinery to eat insects in nutrient-poor soils, Hedrich’s team writes May 4 in Genome Resarch.

Giraffes’ genes tell a not-so-tall tale about growing necks to great lengths.

Tweaks to genes important for development may account for both the giraffe’s stature and turbocharged cardiovascular system, researchers report May 17 in Nature Communications.

Researchers compiled the genetic instruction book, or genome, for both the giraffe and the okapi, its short-necked closest living relative. Those two species’ most recent common ancestor lived about 11.5 million years ago, says Douglas Cavener, a geneticist at Penn State University. Overall, giraffes and okapis still have very similar genes, with 19.4 percent that are identical.
The researchers compared giraffe, okapi and cattle genomes to see what sets giraffes and okapis apart from other ungulates. About 400 genes differ between those species and cattle.

Further comparisons of those genes with DNA from other animals revealed 70 genes in which giraffes had DNA differences from all other mammals. Those uniquely tweaked genes could be responsible for giraffes’ unusual height and physiology, the researchers reasoned.

Among the giraffe’s most distinctively altered genes are some that are well known to regulate embryo development. For instance, the team found alterations in several genes that govern skeletal development, including the gene FGFRL1.

FGFRL1 encodes a protein that helps regulate the size of body segments. Giraffes have the same number of vertebrae in their necks as okapi and other animals do, but the bones are bigger. The giraffe version of the FGFRL1 protein contains seven amino acids that are different than those found in other mammals. Those amino acid differences may change the way the protein works and allow giraffes’ body parts to grow larger than those of other animals.

Some of the same genes that gave the giraffe its long neck — FGFRL1 included — may also be involved in strengthening the cardiovascular system in order to pump blood all the way to the giraffe’s lofty brain, the researchers found. Such multifunctional genes would have allowed coordination of giraffes’ adaptations, Cavener says.
The researchers “provide some very compelling candidates” for genes that shaped giraffe evolution, says Michael Hiller, an evolutionary genomicist at the Max Planck Institute of Molecular Cell Biology and Genetics in Dresden, Germany. More research is needed to show that fiddling with those genes really could turbocharge giraffes’ hearts and supersize their bones. Hiller says he doubts the researchers have found all the genetic secrets to giraffes’ many evolutionary innovations.

Although giraffes have a unique appearance, the statuesque leaf eaters didn’t invent any new genetic tricks to change their hearts and necks, says Cavener. “Giraffes’ novelties almost certainly weren’t created by new genes or pathways, but by modifications of genes and pathways universal to all mammals.”

A notorious Alzheimer’s disease villain may also be a germ-busting superhero. Amyloid-beta gums up the brains of people with Alzheimer’s but also takes out dangerous brain invaders, scientists report May 25 in Science Translational Medicine.

As strong as steel, tough strands of A-beta protein imprison pathogens that threaten the body and brain, experiments in mice and worms show. Those results raise the possibility that A-beta plays a role in the immune system and its accumulation in Alzheimer’s might be prompted by an infection.
Earlier studies have shown that A-beta can bust germs in cells in dishes, but the new experiment shows A-beta protection in living mice and worms. Mice engineered to have the human form of A-beta better survived a brain infection of Salmonella bacteria than mice without the human A-beta, Robert Moir and Rudolph Tanzi, both of Harvard Medical School, and colleagues found. And in the bodies of worms, A-beta helped stave off the dangerous yeast Candida.

When researchers injected Salmonella into mice’s hippocampi, a brain area damaged in Alzheimer’s, A-beta quickly sprang into action. It swarmed the bugs and formed aggregates called fibrils and plaques. “Overnight you see the plaques throughout the hippocampus where the bugs were, and then in each single plaque is a single bacterium,” Tanzi says. That rapid response was surprising, he says. “No one expected that.”
And those prisons are probably permanent, Moir says. “In A-beta, those fibrils set like concrete and the bugs have no chance of ever getting out.”

Alzheimer’s has been linked to a host of bacterial, fungal and viral infections, says immunologist Kevan Hartshorn of Boston University School of Medicine. That work, along with the new study, raises the possibility that Alzheimer’s could be spurred by an immune response to a pathogen.

That’s “an extremely provocative and interesting hypothesis,” says neuroscientist Berislav Zlokovic of the University of Southern California in Los Angeles, who says the new data are convincing. But it remains to be seen whether the results are relevant for people with Alzheimer’s. Zlokovic and colleagues recently found that the barrier between brain and blood weakens with age — a situation that could let more microbes into the brain and perhaps spur A-beta accumulation.
A-beta appears to be a general immune system fighter that’s effective against many enemies, says Moir. “This is a classical innate immune response, which means that whatever gets thrown at it, it does the same thing,” he says. “So whether it’s a herpesvirus, a spirochete or chlamydia, it’s going to generate A-beta plaques.”

Moir also raises the possibility that the amyloid’s germ-busting job might play a role in other diseases that come with amyloid accumulation, such as diabetes or heart disease. “I think we may have stumbled across an underlying theme in a lot of major diseases,” he says.

Finding this helpful role for A-beta may complicate a therapeutic approach for Alzheimer’s that attempts to reduce levels of the protein with antibodies, says molecular pharmacologist Marina Ziche of the University of Siena in Italy. “I have always been very skeptical about that approach,” and the new results suggest that people benefit from some A-beta, Ziche says.

The next step is to see whether pathogens are entombed in A-beta plaques in the human brain, Tanzi says. “Now it’s time to start looking for them in patients.” To start, he and colleagues have just begun a project to catalog the collection of microbes in healthy brains and brains with Alzheimer’s.

Finding a strong link between pathogens and Alzheimer’s could suggest new ways to prevent the disease, Tanzi says. Vaccines that fight infections, for instance, might be one way to prevent A-beta pileup.

Giant squid are the stuff of nightmares. They were even one of the deadly dangers in Jules Verne’s 20,000 Leagues Under the Sea, attacking the Nautilus in a group and carrying off one of the crew:

Just as we were crowding each other to reach the platform, two more arms lashed the air, swooped on the seaman stationed in front of Captain Nemo, and carried the fellow away with irresistible violence…. What a scene! Seized by the tentacle and glued to its suckers, the unfortunate man was swinging in the air at the mercy of this enormous appendage. He gasped, he choked, he yelled: ‘Help! Help!’ … The poor fellow was done for.

What makes Verne’s giant squid all the more frightening is that he didn’t invent the creatures; giant squid strandings had been documented in Europe since at least 1639, and scientists informally described the animals in the late 1850s.

But even if we don’t really have to worry about the huge invertebrates snatching people off boats, giant squid remain mysterious. They weren’t even photographed in the wild until 2004. And many questions remain unanswered about them. The biggest: Just how giant can the giants get? A new study has come up with an estimate — and also highlights the many reasons why it’s so difficult to come up with one.

Charles Paxton of the University of St. Andrews in Scotland starts by laying out five ways that it should be possible to estimate squid length, and why the first four aren’t great measures. Anecdotal accounts — which claim giant squid reaching lengths of 30 meters and 53 meters, not counting the two long tentacles — are often riddled with inaccuracy and exaggeration. Estimating maximum length based on squid growth rate won’t work because squid growth rates just aren’t well known. Some scientists have tried to determine lengths based on the sucker scars found on whales, but since scientists don’t know how whale growth affects the sizes of those scars, those aren’t a good measure either.

Direct measurement of dead squid would seem to be a good option, except that the two long tentacles of a squid — which extend far beyond the animal’s arms and determine its full length — are elastic and can change in length when a squid is preserved, Paxton notes. That leaves the fifth method — estimating length based on the size of the hard beak. Beak size and squid body length are related.

Paxton combined the last two methods to come up with a maximum length for a giant squid of about 20 meters, from the top of its mantle, or body, to the tip of its long tentacles. His estimate appears May 17 in the Journal of Zoology.
The longest squid ever reported was 17.37 meters long, and Paxton questions its veracity, as does another paper published last year in PeerJ. Craig McClain of Duke University and colleagues note that the “longest scientifically verified giant squid” measured a mere 12 meters. “What limits the large size of [giant squid] is unclear,” McClain and colleagues write. But metabolic demands may play a role, keeping squid from getting much bigger than what have washed up onto shore (and also keeping them in the cold depths where they’re so difficult for us to find).

But perhaps the focus on the largest and biggest of species is the wrong approach, McClain and his colleagues argue (in, ironically, a paper all about large marine species). The longest, most giant individuals are, after all, just a tiny fraction of a species — and, these researchers write, “these individuals may reach these extraordinary large sizes through developmental or genetic defects and may not represent the healthiest or, in evolutionary terms, the fittest.”

They are, though, among the most mysterious creatures to inhabit our planet.