On August 16, 1977, Elvis Presley saved me.

    The previous afternoon, I played with my six-year-old peers in Heather Peters^' backyard. I was enjoying my cake, when Heather asked me where my sleeping bag was. Only then did I know this party was a sleepover. The word “sleep-over” to a six-year-old bed-wetter is like what “cancer” means to an adult. But what if I told them I was a bed-wetter? At least with cancer, people gather at your bedside instead of running from it.

    I thought of a way to escape. I would explain that I needed my mother's permission to spend the nights. But as I called my Mom, Heather stood beside me to listen. She granted permission! Then I would be sleeping in the same living room as the other girls. I didn't bring my own pajamas (睡衣)，so Mrs. Peters offered me Heather's pajamas.

    As the other girls drifted into their sweet dreams, I tried to stay awake. “Do I need to go again? I'll stay up to go one more time.. .”.Of course , I finally fell asleep.

    The next morning , I was the first to wake up. I was warm! I lay in panic for what seemed like hours before the other girls started to wake up. I did the only thing I could do — I pretended that the bed-wetting didn't happen. I got up, took off Heather's pajamas and changed into my clothes like the other girls.

    Mrs. Peters walked into the room, and before she could say anything, she stepped right onto the pile of my wet pajamas. My heart stopped as I watched her face burn red. “WHO DID THIS?” She screamed, with a look so frightening. Should I answer? And that was when it happened — Mr. Peters came in and grabbed his wife , "Elvis Presley died!”

    The news of the King's death overtook Mrs. Peters, and I ,was spared. I got home without the other girls knowing what had happened.

    If you want to slow aging, you might want to eat less. This finding is good news—if you were a mouse. The researchers studied mice, not people.

    John Price and other researchers studied two groups of mice. One group was able to eat as much as it wanted. The researchers limited what the mice in the other group ate. Their diet had 35 percent fewer calories than the first group of mice.

    Price says the mice with the diet restrictions were “more energetic and suffered fewer diseases.” They were not just living longer but seemed to stay younger for a longer period of time.

    The researchers found that fewer calories slow down a natural mechanism in cells called ribosomes. Price explains that ribosomes are responsible for making important proteins in the cells. But with fewer calories, they slow down. This gives the cells more time to repair themselves.

    The researchers say ribosomes use from 10 to 20 percent of the cell's energy to make those proteins. Price wrote that “because of this, it is impractical to destroy an entire ribosome” when it starts to break down. However, “repairing individual parts of the ribosome on a regular basis enables ribosomes to continue producing high quality proteins for longer than they would otherwise. This top quality production, in turn, keeps cells and the entire body functioning well.”

    Price said, “ribosome is a very complex machine, like a car.” They need “maintenance to replace the parts that wear out the fastest. When tires wear out,” he explained, “you don't throw the whole car away and buy a new one. It costs less to replace the old tires.”

    “Food,” he said, “isn't just material to be burned—it's a signal that tells our body and cells how to respond.” Price said the findings help to explain how exactly our bodies age. And this may “help us make more educated decisions about what we eat.”

    Miss Parker taught physics in a New York school. Last month she explained to one of her classes about sound ,and she decided to test them to see how successful she had been in her explanation. She said to them, “Now I have a brother in Los Angeles. If I was calling him on the phone and at the same time you were 75 feet away, listening to me from across the street, which of you would hear what I said earlier, my brother or you and for what reason?”

    Tom at once answered, “Your brother. Because electricity travels faster than sound waves.”“That's every good,” Miss Parker answered; but then one of the girls raised her hand, and Miss Parker said.“Yes, Kate.”

    “I disagree,” Kate said.“Your brother would hear you earlier because when it's 11 o'clock here it's only 8 o'clock in Los Angeles.”

    After opening the world's first commercial Direct Air Capture plant（直接空气捕集工厂）designed to pull CO₂ out of the air, Swiss company Climeworks is now trying to create the world's first “negative emission（负排放）” power plant.

    An international team of scientists has been working on a way to turn captured CO₂ into minerals. The project is called CarFix. Experts capture the gas, put it into water and send it to more than 700 meters underground. There the CO₂ on contact with a special kind of rock forms into a mineral.

    “Our results show that between 95 and 98 percent of the CO₂, sent underground was mineralized over the period of less than two years, which is amazingly fast,” says lead author of the CarFix project, Dr. Juerg Matter. Before this discovery it was thought that this mineralization could take hundreds to thousands of years.

    The DAC technology can collect CO₂ from the atmosphere and then store it underground or sell it to business needing the gas. For example, customers can use it in drinks. And the first plant in Zurich is supplying the captured CO₂ to a nearby greenhouse to “feed” vegetables. By using the company's CO₂ the customers can reduce their carbon mission as well as lower their dependence on energy.

    A 2015 study suggested that before the CarFix project, experts could collect CO₂, but they didn't have a large-scale（大规模的）method to safely treat it.

    Combining Climeworks' DAC technology with the CarFix mineralization process they will be able to create a system. This system doesn't put additional carbon back into the atmosphere. Actually it is carbon negative.

    “The economic cost of applying this kind of carbon capture technology on a large-scale is not particularly practical now, but for the first time we are seeing a realistic and effective system,” says Christoph Gebald CEO of Climeworks.

    As the Chinese Mid-Autumn Festival approaches, mooncakes are turning up all over China, from traditional teashops to Starbucks counters. The holiday is one of China's four most important festivals, and in the weeks before the date arrives, top hotels get into the spirit with lavish(奢华) treats in lovely packaging. Traditionally, the cookie-sized round pastry(馅饼) has a rich thick filling usually made from red-bean or lotus-seed paste and covered by a thin crust. It may also contain yolks from salted duck eggs, integrating a beautiful savory tinge into the sugary taste. Fillings and crusts have become more diverse over time, especially in the hands of skilled pastry chefs. The mooncakes in Chinese culture represent homesickness, and the top crust of each moon-shaped pastry is generally imprinted with the Chinese characters for longevity or harmony.

    This year, the fancy gift boxes that have long driven the mooncake trade are particularly striking and rich with tradition.

    For example, the Fairmont Peace Hotel in Shanghai, built in 1929 and a magnet for Hollywood celebrities in the 1930s, has prepared a selection of mooncake gift boxes with designs inspired by the beauty and elegance of the hotel's famous art deco style. The simplest box of four pieces (red-bean paste, creamy custard, plain cheese, green-bean paste) is 198 yuan($29.64), while more lavish selections of five or six pieces, including mooncakes with egg yolk, run up to 338 yuan for a box.

    Beijing's Nuo Hotel, meanwhile, has created Ming Dynasty (1368－1644) inspired mooncake gift packs based on the design of porcelain vases in the hotel lobby, with the essence of landscape painting using Zhang Dai's poetic passages to show the peaceful harmony of man and nature. The box of six is 158 yuan, and includes mooncakes ranging from cheese mango to charcoal burning fragrant Pu'er tea and white lotus with egg yolk. A box of eight cakes of different flavors is 228 yuan.

    Believe it or not, the size of the human brain has become smaller over the past 20,000 years. Scientists argue over whether this means we are becoming more or less intelligent as a species.

    “I'd call that a major downsizing in an evolutionary eye blink (眨眼),” John Hawks told Discover magazine.

    Why is the brain becoming smaller?

    There are different theories to explain it. One is that tens of thousands of years ago, before the decline began, to survive in cold and dangerous conditions, humans needed a stronger and larger body and therefore, a larger head. Also they had to chew the tough meat of rabbits, foxes and horses. As conditions improved, the brain stopped growing, according to supporters of this theory.

    Another theory comes from a recent study by David Geary and Drew Bailey. They found that brain size decreased as population density(密度) increased.

    “As complex societies appeared, the brain became smaller because people did not have to be as smart to stay alive.” Geary told AFP.

    But smaller brain size does not necessarily mean that modern humans are less smart than their ancestors. “Modern humans simply developed different, more complex forms of intelligence,” said Brian Hare.

    Hare's studies focus on two types of great apes: chimpanzees and bonobos. Both are much like humans, but are physically quite different from one another. The bonobo has a smaller brain than the chimpanzee, and is also much less aggressive and more tolerant.

    “When it comes to working out a problem,” Hare said, “chimpanzees are much less likely to accomplish it if it involves working together. Not so with bonobos.”

The smaller brain in modern humans may be evidence that we can cooperate,” Hare told the US National Public Radio.