Have you ever wondered why people drive on a different side of the road? It might seem bizarre that U. K. drivers stay on the left, but they're not the only ones. Around 35 percent of the world population do the same, including people in Ireland, Japan, and some Caribbean islands.

    Originally, almost everybody traveled on the left side of the road. However their way of transport was quite different from today: Think about four legs instead of four wheels. For Medieval swordsmen on horseback, it made sense to keep to the left to have their right arms closer to their enemies. Getting on or off was also easier from the left side of the horse, and safer done by the side of the road than in the center.

    So why did people stop traveling on the left? Things changed in the late 1700s when large wagons (货车) pulled by several pairs of horses were used to transport farm products in France and the United States. The wagon driver sat behind the left horse, with his right arm free to use his whip to keep the horses moving. Since he was sitting on the left position, he wanted other wagons to pass on his left, so he kept to the right side of the road.

    The British Government refused to give up their left-hand driving ways, and in 1773 introduced the General Highways Act, which encouraged driving on the left. This was later made law thanks to The Highway Act of 1835.

    When Henry Ford showed his Model T in 1908, the driver's seat was on the left, meaning that cars would have to drive on the right hand side of the road to allow front and back passengers to exit the car onto the roadside. However, British drivers remain on the left, and this is highly unlikely to change.

    Humans were designed to stand upright(直立). And yet in this modern world, too many of us spend our days with our heads lowered for a simple reason: we're staring at the tiny screen of a smart phone.

    People spend an average of 2 to 4 hours each day with their neck bent while shooting off emails or texts. That's 700 to 1,400 hours a year. The success of social media has led to a rapid development of bad smart phone posture.

    The average adult head weighs 10 to 12 pounds when it's in the upright position. However, because of the gravity, bending your head at a mere 15 degree puts 27 pounds of pressure on your spine(脊椎)；a 30 degree neck bend could equal(等于) 40 pounds of pressure; a 45 degree bend adds the force of 49 pounds, according to the research from Dr. Kenneth Hansraj from New York. These stresses may lead to many problems.

    It's no secret that correct posture is better for your back. According to the researchers, good posture is described as ears aligned(成一条直线) with the shoulders. In proper alignment, spinal stress disappeared. It is the best position for the spine. Standing tall doesn't just make you look better; it improves your health, too. Other studies have found good posture has even been connected to ways of behaving. People who have poorer posture often have poorer physical and emotional health.

    The researchers describe bad posture（姿势）as “the head in a forward position and the shoulders dropping forward in a rounded position”. Bad posture has been connected to many medical problems, including headaches and other problems, depression and heart disease. This is why Hansraj said it's important to be mindful of your smart phone posture. While it is nearly impossible to avoid the technologies that cause these problems, people should make an effort to look at their phones with a correct posture.

    Zero gravity looks cool. But what about the thing no one likes to talk about? Yes, that is right: going to the bathroom. Zero gravity makes this everyday task quite a challenge. Astronauts have to be toilet-trained all over again.

    The Apollo astronauts raised themselves off the seat of their chairs and stuck a clear plastic bag to their back sides with sticky strips. A second astronaut watched closely to be sure no waste matter escaped the seal. (You would not want that stuff floating around the cabin!) When the deed was done, the astronaut cleaned up with a piece of plastic attached to the inside of the bag, removed the bag, dropped a disinfectant(消毒剂) pill in with the waste matter, and put the whole thing, sealed, into a special container.

    Donald W. Rethke, an engineer for Hamilton Standard Space Systems, developed a more private way to answer nature's call: the space toilet. It is somewhat like the kind of toilet one would find on commercial airplanes--with unique adaptations for zero gravity, of course. For instance, it has thigh bars that keep the astronaut from floating off the seat.

    The astronaut (male or female) defecates (排便) in a bag and urinates (排尿) in a hose. Solid and liquid wastes are kept separated because at least 85% of the urine is recycled and, yes, after careful filtration(过滤), used for drinking and other purposes. (Water is always in demand in space.) A vacuum sucks the waste materials into the toilet, where the waste is compacted into hamburger-like patties for easy storage. Although not exactly like an earthbound visit to the toilet, it is at the very least much more private than in the early days of space travel.

    Youth football team members rescued more than two weeks after sudden flooding trapped them in a cave in Thailand are now being well looked after at a hospital in the northern city of Chiang Rai. In addition to treating the boys for potential body fluid loss, inadequate nutrition and lack of oxygen, their doctors also plan to closely monitor them for symptoms of diseases that may have been infected by animals living in the cave.

    "The next step is to make sure those kids and their families are safe, because living in a cave provides a different environment, which might contain animals that could transmit…disease," said the local hospital. The boys and their family members have been told to watch for symptoms such as headache, nausea(反胃), muscle pain or difficulty breathing, the reports added.

    Yet based on the location where the boys were trapped—more than four kilometers from the cave complex's main entrance, past some fully submerged passages—and the fact they have been swimming out wearing full scuba face masks, it seems unlikely that they were living with bats in the cave or breathed in bat-associated bacteria during their rescue, several infectious disease experts said. "It's hard to imagine bats got that deep into the cave because of all those narrow passageways, but it is possible," says Ian Lipkin, an animal expert and professor at the Mailman School of Public Health at Columbia University. "It's unlikely that there would be many animals in there," notes Jonathan Epstein, a doctor at EcoHealth Alliance, a nonprofit organization that studies diseases and how to prevent them. Bats typically like to rest in areas they can easily enter and exit, not in places that fully flood, he adds.

    Bats in Thailand have been linked with a wide range of viruses that are similar to severe acute respiratory syndrome (SARS)—Lipkin says. But it seems more likely the boys would have been exposed to infection-causing bacteria when they swam through the dirty water with cuts and scrapes. "If you are trying to prioritize issues with respect to health care for these kids, number one would be psychological damage and second will be bacterial infections from the cuts and scrapes they may have encountered." Lipkin says.

    Thirteen can be a challenging age. Not only did I have to adapt to my changing body, I also had to deal with my parents' bitter divorce, a new family and the upsetting move from my country home to a crowded town.

    When we moved, my beloved companion, a small brown pony had to be sold. I was heartbroken and terribly lonely. I couldn't eat or sleep and cried all the time. Finally, realizing how much I missed my pony, my father bought me another horse, Cowboy.

    Cowboy was without doubt the ugliest horse in the world. But I didn't care. I loved him beyond all reasons.

    I joined a riding club. When Cowboy and I entered the events where the horse was judged by appearance, we were quickly "shown the gate". I knew nothing could turn Cowboy into a beauty. My only chance to compete would be in the timed speed events. I chose the jumping race.

    For the whole next month we practiced running and jumping for hours in the hot sun and then I would walk Cowboy home, totally exhausted.

    All of our hard work didn't make me feel confident by the time the show came. One girl named Becky rode a big brown horse in the race events. She always won the blue ribbons. I sat at the gate and sweated all out while I watched Becky and her horse charge through the court and finish in first place.

    My turn finally came. At the signal, we dashed toward the first fence, jumped over it without trouble and raced on to the next one. Cowboy then flew over the second, third and fourth fences like a bird and I turned him toward the finish line.

    No cheers filled the air. The end of our run was met with surprised silence. Cowboy and I had beaten Becky and her fancy horse by two seconds.

    I gained much more than a blue ribbon that day. At thirteen, I realized that no matter what the odds, I'd always come out a winner if I wanted something badly enough to work for it. I can be the owner of my fate.

    People can't see you when you're speaking on the phone, but they can hear you. So, the way you speak is especially important. In fact, researchers have calculated that 80% of communication over the phone is through your tone of voice; and only 20% is from the words you use. Here are our top tips on how to speak over the phone.

    ①Facial Expressions

    Your facial expression can influence your voice. For example, if you smile, your voice will sound warm and friendly, just the opposite, if you have an angry look on your face, it can make you sound unpleasant.

    ②Volume

    If you speak too loudly, you could sound angry. And if you speak too softly, it'll be difficult to hear you. So, speak loudly enough to be heard clearly, but not so loud that you're shouting.

    ③Pace

    The pace of your voice is how quickly you speak. And this can show how you feel. For example, an angry person might speak faster than normal. Or a downhearted person might speak very slowly. Try speaking a little more slowly than normal. This will make you sound confident, and it'll make it easier for the other person to understand you.

    ④Gestures

    Gesturing can influence the tone of your voice. When you gesture, you bring more air into the lungs, which can make your voice sound warmer. Gestures are also useful to help you stress the right words or even find the words you need. The best thing about gesturing during a phone call is that no one can see what you're doing, so you can gesture as wildly as you like!

    ⑤Movement

    If you're feeling nervous, stand up and move around. It will reduce the nervousness in your body and help your voice to sound more confident.

    ⑥Pauses (停顿)

    Using pauses every now and then can help you to slow down. This will make you sound more confident and in control. Also, if you pause after giving some new information, it'll give the other person time to understand it. At the same time, listen to how the other person uses pauses. They could tell you something about the speaker's feeling. For example, when a speaker is really angry, he might use pauses and says, "I…am…so…angry…"