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    Driverless(无人驾驶的)technology is quickly progressing with many cars being tested on roads around the world．Now, researchers in Singapore are testing a self-driving scooter，which has four wheels and a seat．It can move at a speed of up to six kilometers an hour．Researchers said the scooter was built with materials that did not cost much money．

    The scooter was developed by the National University of Singapore．Researchers at the Massachusetts Institute of Technology(MIT)also took part in the project．It was designed(设计)for people who cannot，should not or do not want to drive a car．It could help older adults，the disabled or people who are too young to drive．

Marcelo Ang，a researcher at the National University of Singapore，says the scooter can be especially useful for people who use wireless devices(无线设备)while walking on city streets，because there is a sensors(探测器)in it． “I'm sure you have experienced people who almost run into you while using their phones on the street．Would it be so nice to drive the scooter without worrying about the safety?”he says．Besides，developers of the scooter say it can work together with ride—sharing services to make trips completely easy and safe．

The researchers hope the scooter will reduce the need for cars，which can lower pollution and reduce accidents．

    Marcelo Ang says the scooter has completed many successful tests at the university．Kevin Xiangyu Hui，a university student．tested the scooter and said he found the ride was very smooth and safe．“When I sat on this machine．I felt really relaxed and it was really cool．”The scooter has yet to complete lots of road tests so it is not available to buy at present．

    Many hundreds of years ago, the moon was a mystery to people on the earth. What was that glowing ball came out at night? Why did it keep getting smaller, then larger? Why didn't it fall from the sky? Through the ages, people have tried to come up with answers.

    To the native people of Bolivia, in South American, the moon was a great chief who once lived on the earth. The Abaluyian people of Kenya, in Africa, believe the moon and the sun were brothers who fought in the sky. In other parts of the world, people believed they saw different pictures in the moon. The Haida Indians of Canada saw a woman carrying a bucket. The Chinese saw a road.

    People in the past also used the moon to mark time as a kind of calendar. In fact, in some languages, the word for moon meant “month”. A Native American nation called the Sioux made a calendar of 13 moons, or months. Each moon had a name, such as Moon of Black Cherries, Moon of Green Corn, and Moon of Severe Cold.

    Though people of the past found the moon was helpful, mysterious and interesting, they didn't know much about it. They only knew what they could see with their own eyes.

    Then almost 400 years age, an Italian scientist named Galileo made a new telescope(望远镜) that was more powerful than any telescope made before. Galileo decided to take his new implement to look at the moon. He discovered that the moon was not the smooth, shiny ball. The brighter places were mostly hills and mountains. The flat areas were lower, which is why they appeared darker.

    As more people saw the moon through telescopes, they discovered more about it. Yet, people still had much to learn about the moon.

    You can be proud of yourselves, even if you can only make one or two of these green changes. The goal here is to limit carbon dioxide and other greenhouse gases, which are closely connected to the big problem of global-warming (全球变暖).

    WAY 1: Bring your own cup to Starbucks. You'll get a 10-cent discount, and it's one less paper cup to end up in a dustbin. The store won't create more waste when they throw away a cup.

    WAY 2: Turn off your computer. When in standby mode, your PC is still using energy. Turning off a monitor (显示器) for 40 hours a week may only save $ 5 a month, but it reduces CO₂ by 750 pounds.

    WAY 3: Reuse plastic bags. Instead of throwing away 100 billion plastic bags a year, try and get a second, third, or tenth use out of them. Better yet, next time you shop, try a reusable bag. The amount of oil it would take to make just 14 plastic bags would run your car for one mile.

    WAY 4: Use recycled paper in the bathroom. Most of the toilet paper we use is made from trees found in forests. If every family replaced(替换)one roll of toilet paper with a recycled one, 424,000 trees would still be standing.

    WAY 5: Plant a tree. Adding green to your garden is beautiful and earth-pleasing. Just one tree will help make cleaner air and save the environment from 5, 000 pounds of hot carbon dioxide each year.

    Like most of her friends, Georgie Sanderson has 24-houpa-day access(使用权) to technology through her mobile phone, iPod Touch and home computer. But the 15-year-old girl says she is too busy to spend her days on Facebook. She only uses it once or twice a day. "The 10th grade is busy, and I have to work hard. Even when I'm not studying, I have better things to do with my time, such as being outside or spending time with my friends," she says. Georgie has a part-time job. She watches TV for a while in the afternoon and she helps with the housework.

    Georgie's words prove the findings of a new report. According to the report, teenagers today are not completely dominated(支配) by technology, although they have been into a digital(数字) world. They spend most of their time on their homework, TV, part-time jobs, hobbies, sports, friendship or reading instead of playing or chatting on the computer. But the report also finds that mobile phones are important to teenagers. 95 percent of 18 year-olds have got one mobile phone, and 82 percent sleep with their mobile phones on and beside them all night.

    For Georgie, sleep is more important than texting others. Georgie is also careful about the use of IT. She says, "Social media is helpful, but it is so distracting(使人分心的). I only use it when I do need to use it."

    It's every parent's worst nightmare there's a fire in the house, the alarms are beeping, but the children are sleeping on. Now scientists have found a better way to rouse slumbering youngsters. Researchers in the US have discovered that playing a child a recording of his mother's voice is about three times more likely to wake him up than a traditional alarm.

    Writing in the Journal of Pediatrics, Smith and colleagues report how they compared the effects of four different smoke alarms on 176 children aged between 5 and 12 years old, none of whom had hearing difficulties or were taking any medication that affected their sleep. While one alarm featured a high-pitched beep the sort of commonly found in households the other three featured the voice of the child's mother calling either the child's name, giving instructions such as: "Wake up! Leave the room! ", or both. Each child slept in a lab-based room that resembled a real bedroom.

    The results show that vocal alarms appear to be more effective than high-pitched beeps. About 90% of children woke for a voice alarm compared with just over 53% for the traditional alarm.

    “High pitched beeping alarms don't wake up children well at all under about 12 years of age, "said Dr Gary Smith, a co-author of the research from the Nationwide Children's hospital in Ohio, although

he said at present it is not known why. He said it was important to look at developing better alarms.

    Prof Niamh Nic Daeid, director of the Leverhulme Research Centre for Forensic Science at the University of Dundee, said the research found a human voice combined with a low-frequency pulsing tone was far more effective in waking up children than a traditional high-pitched alarm. She also noted that more work was needed to explore whether other familiar sounds, such as a dog barking, might also prove effective in rousing children.

    Skin-diving (自由潜水) is a new sport today. This sport takes you into a wonderful new world. It is like a visit to the moon! When you are under water, it is easy for you to climb big rocks because you are no longer heavy. Here, under water, everything is blue and green. During the day, there is enough light. When fish swim nearby (附近), you can catch them with your hands. When you have a tank (罐) of air on your back, you can stay in deep water for a long time. But you must be careful. To catch the fish is one of the most interesting parts of this sport. On the other hand, you can clean the ships without taking them out of the water. You can get many things from the deep sea. Now you can see that skin-diving is both useful and interesting.