3 . The last attempt of Ken Campbell to run could date back to high school. When his wife, Susan, injured her foot, she needed support to rejoin her running group, so Campbell went along to keep her company in the recovery.” We were just walking at the beginning,” he says, “I was heavy, and weighed over 90kg.” But as the weeks and months passed, the weight fell away, Susan recovered and Campbell’s abilities grew. At the age of 63, he ran 50km, and at 70, he completed a 100km ultramarathon.

So how does someone with no experience of running become an ultradistance runner in his 60s and 70s? Susan had run marathons before her injury, but for Campbell, the turning point came when Susan’s Fleet Feet running group started training near their home.

Campbell went out to visit Susan’s group, and “the paths were a terrible mess. It had been raining, and I was slipping, sliding and falling. But I thought, well, I like this a lot.” What he liked above all was the feeling of “being wrapped by the path, being hugged by the closeness of the plants and the nearness of the river”.

Running the 100km ultramarathon took Campbell 16 hours. When Campbell crossed the finish line, Susan handed hima100km sticker to display on the back of his truck. “It is a public statement that you are part of this community,” he says. “Wherever we park, I see a line of vehicles with their various stickers and I feel that we area community.”

Campbell suffered from arthritis before he started running, and was “waiting for knee replacement”, but for now, he no longer needs an operation. It can put an end to the running—but the “sense of wellbeing and achievement will carry me on forever”, he says, “If I can’t run, I will walk.”

4 . Chinese Teapot Escaping from British Museum Goes Viral

Chinese state media has praised a viral video series telling the story of a jade teapot coming to life and fleeing the British Museum to make its way back home.

The set of three short videos, entitled Escape from the British Museum, shows the teapot turning into a young woman in a green dress, who then engages a London-based Chinese journalist to help her reunite with her family. It appears to have struck a chord (弦) in China after first being released by independent vloggers on Douyin. By Monday evening, it had reportedly received more than 310 million views. The plot line taps into growing Chinese criticism of the British Museum after reports last month that more than 1,500 priceless objects, including gold jewelry, semi-precious stones and glass, were missing, stolen or damaged.

In August the state media Global Times called for the return of Chinese artifacts from the museum “free of charge” in the wake of the controversy. “The huge holes in the management and security of cultural objects in the British Museum exposed by this scandal (丑闻) have led to the collapse of a long-standing and widely circulated claim that ‘foreign cultural objects are better protected in the British Museum’,” it said. It strongly supported the video series for touching on a “powerful message” about the importance of cultural heritage and reflecting “Chinese people’s desiring for the repatriation of the Chinese cultural relics.”

State broadcaster CCTV also gave the short films a glowing review saying: “We are very pleased to see Chinese young people are passionate about history and tradition... We are also looking forward to the early return of Chinese artifacts that have been displayed overseas.”

The museum scandal made headlines around the world and reawakened earlier demands by the Chinese media to restore the country’s relics. The new three-part show has triggered a wave of nationalism among viewers, with many praising the creative plot that reduced them to tears by showing how the teapot experienced the happiness of returning to China to see pandas and watch a flag-raising ceremony on Tiananmen Square.

7 . If a diver surfaces too quickly, he may suffer the bends. Nitrogen(氮) dissolved(溶解) in his blood is suddenly liberated by the reduction of pressure. The consequence, if the bubbles (气泡)accumulate in a joint, is sharp pain and a bent body—thus the name. If the bubbles form in his lungs or his brain, the consequence can be death.

Other air-breathing animals also suffer this decompression(减压) sickness if they surface too fast: whales, for example. And so, long ago, did ichthyosaurs. That these ancient sea animals got the bends can be seen from their bones. If bubbles of nitrogen form inside the bone they can cut off its blood supply. This kills the cells in the bone, and consequently weakens it, sometimes to the point of collapse. Fossil (化石)bones that have caved in on them selves are thus a sign that the animal once had the bends.

Bruce Rothschild of the University of Kansas knew all this when he began a study of ichthyosaur bones to find out how widespread the problem was in the past. What he particularly wanted to investigate was how ichthyosaurs adapted to the problem of decompression over the 150 million years. To this end, he and his colleagues traveled the world’s natural-history museums, looking at hundreds of ichthyosaurs from the Triassic period and from the later Jurassic and Cretaceous periods.

When he started, he assumed that signs of the bends would be rarer in younger fossils, reflecting their gradual evolution of measures to deal with decompression. Instead, he was astonished to discover the opposite. More than 15% of Jurassic and Cretaceous ichthyosaurs had suffered the bends before they died, but not a single Triassic specimen(标本) showed evidence of that sort of injury.

If ichthyosaurs did evolve an anti-decompression means, they clearly did so quickly—and, most strangely, they lost it afterwards. But that is not what Dr Rothschild thinks happened. He suspects it was evolution in other animals that caused the change.

Whales that suffer the bends often do so because they have surfaced to escape a predator (捕食动物) such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches. Triassic oceans, by contrast, were mercifully shark- and crocodile-free. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey(猎物) as well as predator—and often had to make a speedy exit as a result.