Let's face it. No one drinks diet sodas for the taste. People drink diet sodas in the hope that it will help them lose weight or at least keep them from gaining it. Yet it seems to have exactly the opposite effect, according to a new study.

    Researchers from the University of Texas said those who drank two or more diet sodas a day had waist size increases that were six times greater than those who didn't drink diet sodas. ＂What we saw was that the more diet sodas a person drank, the more weight they were likely to gain,＂ said Sharon Fowler.

The study was based on data from 474 participants in a large, ongoing research project, where the participants were followed for nearly 10 years.

    While the findings are surprising, they also offer some explanations.

    Nutrition expert, Melanie Rogers, who works with overweight patients in New York, has found that when patients are switched from regular to diet sodas, they don't lose weight at all. ＂We weren't seeing weight loss necessarily, and that was confusing to us,＂ said Rogers.

    So why would diet soda cause weight gain? No one knows for sure yet, but it could be that people think they can eat more if they drink diet sodas, and so over-compensate for the missing calories.

    A related study found some sweeteners (甜味剂) raised blood sugar levels in some mice. ＂Data from this and other potential studies suggest that the promotion of diet sodas and artificial sweeteners may be risky,＂ said Helen P. Hazuda, professor at the University of Texas's school of medicine. ＂They may be free of calories, but not of consequences.＂

    What's going on under Liverpool?
A Rainy Day in Liverpool

    Dark clouds appear over the River Mersey and a cold wind is blowing. A few rain drops are beginning to fall. We're in the famous city of Liverpool and we're going to spend this rainy day in the Williamson Tunnels.
  An Interesting Life Story

    Joseph Williamson was born into a poor family in 1769，but left home and went to work for a tobacco company aged 11. He began at the bottom, and finally became head of the business.

 An Unsolved Mystery

    Nobody knows why Williamson dug tunnels under most of Liverpool, but many think it was to create jobs. Perhaps half of Liverpool's population worked for him. The industry of war had made enormous amounts of money, but now Liverpool was in a terrible financial situation.

 The King of Edge Hill

    I went on a guided tour starting close to where his empire began in Edge Hill. In the tunnels, the steps leading from rooms below ground to those buildings, which no longer exist, seem particularly ghostly.

Incredible Engineering

    We go into the Double Tunnel. It's just been discovered that it's actually a triple tunnel - but nobody knows why the three tunnels were built on top of each other.

    We finish the tour and decide we'll have a coffee in the Williamson Tunnels Cafe Bar. There, I notice lots of flyers for bands and theater groups that are coming to play there.

Why Liverpool?

    Apart from the obvious attractions like the football clubs, or anything to do with the Beatles, Liverpool has a lot to offer. Princes Park and Croxteth Park were royal hunting grounds and the trees are 200 years old. Renshaw Street displays are an unusual mix of architecture styles. The nightlife is exciting. If you want to experience a part of the British Isles with a character entirely different from London, you should definitely come to Liverpool.

    The quality of our seafood has been in the news a lot lately. A new study has found that people who eat seafood are also eating plastic — 11,000 pieces of microplastic per year to be exact.

    Researchers at the University of Ghent in Belgium found that seafood eaters are consuming plastic at a concerning rate.

    “Per serving of mussels (贻贝), which contains about 300 grams of mussel meat, you get 300 pieces of plastic inside your body,” researchers wrote. Researchers don't yet know the implications of eating microplastic, but they worry that it could have negative consequences on our health.

    While we don't know what microplastic does yet to humans, we do know what it does to sea animals. In earlier studies, scientists have found that when fish eat microplastics, it prevents their growth and changes their feeding patterns. In fact, fish will stop eating natural sources of nutrients, and only go for plastic.

    When you're done using plastic, a small portion (部分) may be recycled. However, more than likely it's in a landfill or making its way towards the ocean. Once rubbish hits the water, sea creatures may mistake it for food. This often leads to poisoning or death. If they get caught for human's food, the plastic may very well make its way back to you — on your dinner plate.

    According to a study published in Science magazine, eight million tons of plastic go into our waterways every year. The problem is so serious that scientists say that by 2050 the weight of plastic in our oceans will outweigh fish. And just because it's out of sight, it doesn't mean it should be out of mind.

    There's no immediate way to prevent microplastic from ending up in your body. However, you can help reduce the amount of plastic reaching rivers, lakes and oceans in the first place. You can make a difference with your choices every day. Even small changes will add up. While your dinner may contain microplastic, you can help prevent the future generations from having that same problem.

    We all know that exercise is good for your health. But some kinds of exercise may be better than others.

    Running, for example, may help to protect against heart disease and other health problems. Running may also help you live longer. Researchers say it is not important how far you run. It also does not matter how fast or even how often you run. As advertisements for the running shoes Nike say, “Just Do It.”

    Recently researchers studied more than 55,000 adults. About one-fourth of the adults reported running regularly. The study found these runners were considerably less likely than non-runners to die of any form of disease, including heart disease. In fact, the runners lived, on average, three years longer than the non-runners.

    This study lasted 15 years. During that time, more than 3,400 of the individuals died. About 1.200 of the deaths were linked to heart disease, hear, attack or stroke.

    One of the researchers is a man named D.C. Lee, a professor of Iowa State University Compared to non-runners, he said, runners showed a much lower risk of dying from some diseases. “Compared to non-runners, runners showed 30 percent lower risk of death by any causes, including heart attack, stroke and cancer. Also, runners compared to non-runners showed 45 percent lower risk of death by cardiovascular diseases（心血管疾病）, including heart attack and stroke.”

    D. C. Lee and the other researchers found that speed, distance and how often one runs made little difference in reducing the risk of death. The runners in the study averaged between 10 and 16 kilometers per hour. Mr Lee said slower runners and those who only ran once or twice a week were helped nearly as much as those who ran faster and further. “And also we looked at the inning over time and we found that persistent runners（over six years）showed the biggest benefits, as well.”

    Robots come in many shapes and sizes. But most have one thing in common. They are built to help people. Lately engineers have been developing new kinds of humanoid robots. These high-tech machines are designed to lend a hand everywhere from hotels to disaster areas.

    "Robots help people by making their lives easier, safer, and more fun," says engineer Omar Abdelwahed.

    Since November, a robot named pepper has been on the job at the Mandarin Oriental hotel in Las Vegas, Nevada. When guests have questions or need directions, they can ask Pepper. They can also use the robot's touch screen to find the information they need. Pepper is able to talk with guests and entertain them with stories too. It can even tell what kind of mood they are in.

    "Pepper provides our guests with information in an exciting and new way," says hotel manager Donald Bowman.

    For a kid, being in the hospital can be boring and even scary. But a small robot called NAO is helping to make hospital stays easier. It was designed to keep people company.

    A Tennessee doctor named Phil Parker bought a NAO robot three years ago. He programmed it to talk to and play with young patients. He brings it to hospitals to help sick kids. When kids get medical tests, NAO explains what is going on. The robots also reads to kids and plays games with them like rock, paper, scissors.

    "The robot gets many kids to smile for the first time since they've been in the hospital," Parker says.

    Other robots are being developed to help in places where it's hard or risky for people to go. For example, disaster areas can be full of rubble and other dangers. Engineers in Japan are building a robot called E2-DR to go into those areas and search for people who are hurt.

    My favorite book, The Secret by Rhonda Byrne, talks about a formula called "SFF" which stands for "stopping finding faults". I used to be a critical person and tried to find faults. I guess I somehow inherited this character from my father. Actually, many good qualities of my father are worth admiring except this.

    My father is the person who constantly looks for mistakes in other people and he thinks no one is perfect in the world. His character created a negative atmosphere in my family. I was the same as my father, so I often felt angry, disappointed, depressed, and lonely in school.

    After I had read my favorite book I began to seek "good things" in other people. It has completely changed my life. Now I feel happier, I have more friends, I have more trust in people, and I realize everyone has their own strength! Another important lesson I got from this book is that I should always behave myself in a positive manner. Let's admit that we sometimes complain about our situation. That's not good. "Believe it or not, people don't like to listen to negative opinions."

    One more valuable lesson I got from the book is that I should be a good listener. When I was younger, I only wanted people to pay whole attention to my words so that I could show them how important I was. I was very proud and would show off my achievements in school without considering others' feeling. I had very few friends and most people considered me as an "arrogant" person. Now, I find it much easier to make friends after making some changes!