The average（平均的）American child spends three to five hours a day watching TV. In 1961, the average child began to watch television at age three; however, today it is nine months. Yet, most parents think that television has bad influence on their children. For example, in the early 1970s, my parents believed that my bad eyesight was the result of sitting too close to the screen, and they therefore made my stay at least six feet from it. Today, most people have no such worry, but many new ridiculous (荒谬的) sayings have appeared:

      *TV makes kids stupid. Many children watch more educational programs when they are pre-schoolers. When they grow up, they can read more books and have much better ideas to solve difficult problems than other children.

     *TV makes kids violent. The real story is not so simple. Hundreds of studies show that watching violence on TV makes children more aggressive (好斗的). But a study of over 5,000 children also finds that some positive programs make children kinder. The problem is that kids are increasingly watching shows with violence instead of those suitable for their age.

      *Sitting around watching TV makes kids overweight. An experiment finds that when children watch less television, they do lose extra weight; however, reducing their television time does not make them more active. The real problem lies in snacking (吃零食). A widespread habit for kids, and junk-food advertisements.

      *TV helps kids get to sleep. The opposite is true. The more television children watch, the more likely they are to have irregular sleep and nap (小睡) patterns. Allowing kids to watch television is part of the problem, not the solution.

Cure for tiredness?

    Staying up late is a potential battle between parents and kids. But the solution could be as simple as changing your meal time.

    Researchers at the University of Surry, UK, found that delaying meals could help change one of the internal body clocks. Besides a “master” clock in the brain, there are clocks in other parts of the body. They are usually synchronized according to factors including light.

During the study, researchers tested 10 participants to examine the effect of changing meal times on their body clocks. The participants were given three meals —breakfast, lunch and dinner. In the first stage, participants received breakfast 30 minutes after waking. Lunch and dinner followed, after 5-hour intervals. In the second stage, each meal was delayed by 5 hours. Right after each stage, blood and fat samples were collected.

    Results showed that later meal times greatly influenced blood sugar levels. A 5-hour delay in meal times caused a 5-hour delay in the internal blood sugar rhythms.

    The discovery showed that meal times are in line with the body clock that controls blood sugar levels.

    This is a small study but the researchers believe the findings could help jet lag sufferers and night-shift workers.

    In a study by the University of Surrey in 2013, researchers explored what happened when a person's body was changed from a normal pattern to that of a night-shift worker's.

    After people work through the night, over 97 percent of the body's rhythmic genes are disrupted（扰乱，使混乱）.

    These findings explain why we feel so bad following a long flight, or after working at night, according to Simon Archer, one of the study's researchers.

    “It's like living in a house. There's a clock in every room in the house and in all of those rooms those clocks are now disrupted, which of course leads to chaos in the household,” fellow researcher DerkJan Dijk told the BBC.

Changing meal times didn't affect the “master” body clock — the one controlling when we get sleepy — but it can reset the body clock that controls blood sugar levels. This wouldn't necessarily cure jet lag completely, but it might reduce the negative effects.

A study published earlier this year suggested that just a weekend camping trip could be enough to reset our body clocks. And now this latest research shows regular food schedules could play a key part too.

    Sam Allred suffers from a rare and incurable kidney (肾脏) disease. One day, when his sister was playing a song repeatedly, Sam sang along. His sister thought it was funny so she recorded it and posted the video online. The video — and Sam — became a hit. Only 8 years old at the time, he couldn't have expected the response.

    "The Doctors (The television show) called and wanted me on their show so they paid for me to go to California," says Sam, now 13, "and we got to stay in a hotel where all the movie stars stayed."

    During that visit to California, Angie Allred, Sam's mother, had an idea about Sam writing a children's book. Together, she and Sam wrote Opening Hearts, which tells Sam's experience of living with a chronic (慢性的) illness.

    "I wrote the book to teach people to be kinder to people," Sam says. Moreover, Sam wanted to send pillows to sick children staying in hospitals around the country to make their stay more comfortable, an idea that came from a time when he was in the hospital.

    "A few kind boys came in with pillows and they gave me one and it meant a lot to me that someone cared about kids in the hospital," says Sam.

    Angie thought of starting a nonprofit organization to provide a way for people to contribute money to realize Sam's ideas. She named the nonprofit Kindness for Kids.

    Since then, Sam has taken pillows to children staying at Providence Hospital in Anchorage.

    Sam's father, Scott Allred, owns a small business that contracts (承包) shipping services with FedEx Ground. He asked the company for help.

    "FedEx Ground learned about Sam's pillow project," says Erin Truxal, manager of public relations for FedEx Ground. "We thought, 'What a perfect way for us to get involved.' "

    The company provided shipping services for Sam to ship about 5,000 pillows to hospitals.

    Sam wants to send more pillows to all of the children's hospitals in every state. His goal is simple: "Kids in the hospital as happy as they were before they got sick," he says.

    The iPhone XS and iPhone XS Max's internals are nearly the same: With each, you get a 12 megapixel camera, better-sounding speakers and the ability to pack two SIM cards into one device for international travelers or people who have to turn between a device for work and one for personal use.

    The phones come with Apple's new A12 bionic chip, which helps make Face ID and games load faster. Apple played up the speed of these new phones during its product announcement, and they are fast. But so were the models before them.

    Both models feature beautiful OLED screens that make watching videos, especially on the XS Max, totally surprising.

    Battery life is also improved on both devices. Apple (AAPL) says you can spare about 30 minutes longer on the XS compared to last year's X, and 90 minutes longer on the Max. It's not a game changer, but we'll take any extra minutes we can get.

    There is one major difference between the iPhone XS and XS Max: size. The Max is unquestionably big, but it's technically the same size as the iPhone 8 Plus. The edge-to-edge screen creates the illusion（幻想）the device itself is 21% larger than its predecessor, but it'll fit in your hands just as easily (or not) as older Plus models.

    But it's hard to shake the feeling that the device is big just to be big. Unlike the Samsung (SSNLF) Galaxy Note or the iPad, the XS Max doesn't support many features tailored for bigger screens, such as another row of apps or a side-by-side display that lets you use two apps at once. It's a missed opportunity.

    The real star of the new models is the camera. A new feature called Smart HDR shoots a four-frame object taken at different exposures and settings and mixes them together to create more detailed shots — similar to an existing feature on the Google Pixel 2.

    But the likely fan favorite feature is a change to the iPhone's Portrait Mode that lets you change the depth of a photo after you take it, allowing you to have more creative control. For example, you can snap a shot of a friend on a beach and change the background for an artsy feel. If you decide later you want to see more of the ocean, you can change the background via the edit button.

    It's an impressive feature, but the results also depend on your photo skills and the lighting. When it's good, it's really good. When it's not, you'll still get a good-looking picture. The Pixel 2 and Samsung Galaxy S9 offer a similar feature, too.

    The XS and XS Max come with headphones, but unlike last year, you won't find an adapter included in the box. This means you'll need to spend $9 more if you want to use an old pair of headphones. It's Apple's way of saying it's finally time to get over the fact there's no longer a headphone jack.

China's Tianwen 1 Mars probe (探测器) conducted its fourth orbital correction on Friday evening, as the spacecraft makes ready for its arrival in orbit around Feb. 10, according to the China National Space Administration.

The name comes from the long poem Tianwen, meaning Heavenly Questions or Questions to Heaven, written by Qu Yuan, one of the greatest poets of ancient China. In Tianwen, this name conveys the Chinese nation's steady effort in pursuing truth and culture of exploring nature and the universe. CNSA also unveiled (发布) the logo of China's planetary exploration missions, featuring the letter C, signifying China, international cooperation and capacity of entering space.

Tianwen I has flown for 197 days and more than 465 million kilometers on its journey to the planet. It is now around 184 million km from Earth and I. I million km from Mars. Depending on the two planets' orbits, Mars is between 55 and 400 million km from Earth. Mars probe Tianwen I is seen in its first selfies in space on Oct. 1, 2020. The administration also published a black-and-white picture of Mars taken by Tianwen I, the first snapshot (抓拍的照片) from the Chinese craft.

Tianwen I, the country's first independent Mars mission, was launched by a Long March 5 heavy-lift carrier rocket on July 23 from the Wenchang Space Launch Center in Hainan province, kicking off the nation's planetary exploration program.

A successful landing would make China only the second nation to place a spacecraft on the Martian planet. China would also be the first to successfully orbit, land and deploy (部署) a vehicle in the same mission. According to experts, searching for signs of life on Mars will be the first and foremost scientific goal. China is open and inclusive in the development of its space technology not least because it believes that the exploration of outer space should help build a community with a shared future for mankind.

L. Bean Quad backpack

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Kanken 15" backpack

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