In the world of Chinese archaeology(考古学), a sign of a dig's importance is the sight of Zhou Mingsheng at work. A field technician who has worked at archaeological sites all around China. Master Zhou is credited with the gentlest touch in his profession. Born into a farming family, he is a "national-level craftsman" with a talent for using simple tools to get relics(遗物) that would crumble in other hands, says his current boss, Wang Xu, director of an archaeological site at Shuanghuaishu, a Neolithic(新石器时代的) settlement near the Yellow River in the central province of Henan.

It is not beauty that attracts visitors to Shuanghuaishu. At 5, 300 years old, the settlement is the work of a culture too simple to have left behind many buried treasures. The single most precious find, to date, is a finger-length sculpture of a silkworm. Nor is the setting lovely: an area surrounded by deafening insects, between a highway and two power stations. Rather, the site's importance is historical. For since the birth of Chinese archaeology in the 1920s, it has been inseparable from claims that China has the oldest unbroken civilisation on Earth.

Leading archaeologists say that the site has the right combination of location, age and distinctive cultural elements to be the capital of an early Chinese kingdom. That would make it a bridge between China's written history and the era of the Yellow Emperor, who is said to rule over these central plains almost 5, 000 years ago, though many foreign scholars doubt his existence. Chinese media call the site proof of China's 5, 000 years of history.

Foreigners complain about a lack of written records, Mr. Wang notes. Perhaps they are missing symbols that will one day be understood, for instance in patterned pottery. Outsiders "can't keep using Western standards to apply to Chinese ruins," he argues.

A team of Dutch researchers has discovered that magpies (喜鹊) are using metal spikes (things with sharp points) designed to keep them away from certain urban areas to make their own nests stronger and keep invaders at bay.

Scientists have known for a while that magpies are some of the most intelligent birds in the world, but even they were puzzled by their amazing ability to adapt to hostile urban environments, It's not unusual for birds to use human trash as tools and building materials for their nests, but seeing them use the very things we humans use against them was nothing short of puzzling for researchers at the Natural History Museum in Rotterdam and the Naturalis Biodiversity Center in Leiden, in the Netherlands.

"I didn't expect this. These anti bird spikes are meant to deter birds, they are supposed to scare them off, but on the contrary, the birds just use them." Kees Moeliker, the director of the Natural History Museum Rotterdam, told The Guardian.

One particularly impressive magpie nest was discovered in the courtyard of a hospital in Antwerp, Belgium. It was made up of around 1,500 anti-bird spikes, most of which seemed to be positioned with the sharp point outwards, as protection against invaders. After discovering it, researchers checked the roof and confirmed that around 50 meters of anti-bird spike strips had been ripped off the building, leaving only the glue used to fix them in place.

Birds have been known to take sharp objects, from point y branches to nails, screws, into their nests as protection, but the use of anti-bird spikes is kind of ironic, as they are the very things used to keep them away. To scientists like Hiemstra, this is a sort of "beautiful revenge".

A few years back, we wrote about rich people in the UK installing anti-bird spikes on trees to stop birds from pooping on their luxury cars, but I guess the birds had the last laugh...

About a dozen women have gathered as their instructor guides them through the moves. "Backstroke!" Jean Bailey directs from her chair, raising her arms high, as the women of Elk Ridge quickly begin arm rotations. Everyone puts in top effort.

Bailey, who is 102, has been teaching them four times a week in the hallway of the second floor for about three years. "When I get old, I'll quit," said Bailey. Some of her regulars have arthritis (关节炎) that limits their movements, but they can do the stretching exercises comfortably and benefit from them, said Bailey, who herself often uses a walker.

"After attending the class, we've gotten pretty close up there on our floor. One of us would do something for anybody. We really keep track of each other," Phyllis Black, 87, said. She lives down the hall from Bailey; if she skips them, she feels stiff. "She's a very nice neighbor, and she's a good friend also. She's very talented."

When her children were young, Bailey became a florist (花匠) — a practice she still enjoys as a hobby. She buys artificial flowers and makes bouquets (花束) for the clubhouse and some residents. Laura Stuart calls her the "queen bee". "She brings her expertise in floral arrangements and is always doing beautiful arrangements," Stuart said. "She brings that to us, and it's just a blessing that she's still here with us to even do such a complex type of floral arrangement."

At Elk Ridge, residents can participate in fitness activities like a walking club, tai chi and working out in a fitness room. But Bailey's ladies seem to prefer her class because of her warm and fun personality, and the gentleness of the stretches for people who have mobility challenges, says Sean Tran, operations director at Elk Ridge. "More than anything, her general outlook on life…is just remarkable," he said about Bailey. "She's the nicest, most thoughtful, caring person that I probably ever met. Nothing is going to stop her," Tran said. "She's going to keep going, no matter what. And others look at her and think: 'If she can do this at 102, I can do this at my age, whatever it is.'"