In most parts of the world, many students help their school make less pollution. They join “environment clubs”. In an environment club, people work together to make our environment clean.

     Here are the things students often do.

      No-garbage lunches! How much do you throw away after lunch? Environment clubs ask students to bring their lunches in bags that can be used again. Every week they will choose the class that makes the least garbage and report it to the whole school!

    No-car day! On a no-car day, nobody comes to school in a car, not only the students but the teachers as well! Cars give pollution to our air, so remember to do such things: walk, jump, bike or run! Use your legs! It's very fun.

    Turn off the water! Do you know that some toilets can waste twenty to forty tons of water an hour? In a year, that would fill a small river! In environment clubs, students mend those broken toilets.

    We love our environment. Let's work together to make it clean!

    This is the end of our radio programme. Wish you have a good night. This is Grace Brown.

    Let's take a look at the cool inventions in science and technology.

Robot-teacher

    Some students in South Korea have new language instructors: the English-teaching robots. The robots help students practise speaking English. South Korea employs many foreigners to teach English. The robot-teachers can help to solve a shortage of English teachers. Can robots replace human teachers one day?

Superhero suit

    Have you ever dreamed of becoming a superhero? There's a real Iron Man suit, XOS 2. The suit provides the power to lift 200 pounds and break the wood easily. It was designed to help the military with heavy lifting. One person in the suit can do the work of three soldiers.

Hard-working robot

    The EMIEW2 robot is a perfect office helper. It can guide visitors to the places they want to go. The three-foot-tall robot can know different human voices and react to instructions. One day, it may work as a receptionist or a guard.

    Is there intelligent（有智力的）life on other planets? For years, scientists said "no." or "we don't know." But today this is changing. Seth Shostak and Alexandra Barnett are astronomers（天文学家）. They believe intelligent life exists（存在）somewhere in the universe. They also think we will soon contact them.

    Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. "This is long enough for other planets to have intelligent life, "say Shostak and Barnett. The second reason is size the universe is huge. "Tools like the Hubble Telescope（哈勃望远镜）have shown that there are at least 100 billion galaxies, "says Shostak. "And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to the earth. "

    In the past, it was hard to look for signs of intelligent life in the universe. But now, powerful telescopes（高倍望远镜）allow scientists to discover smaller planets-the size of Mars or the earth-in other solar systems, these planets might have intelligent life.

    Have beings from space already visited the earth? "Probably not, "says Shostak. "It's a long way away. However, intelligent beings may contact us in other way, such as radio signals（信号）. In fact, they may be trying to communicate with us now, but we don't have the right tools to receive their messages. However, this is changing. By 2025, we could make contact with other life forms in our universe and we might help each other. "

    Have you ever dreamed about a trip to the space? Seeds (种子) of some vegetables and crops are a lot luckier than you, as they have travelled to space and back.

    China is among the three countries in the world that carry out agricultural research (农业研究) in space. The others are Russia and the US.

    Since 1987, China has sent about 1, 000 species of seeds into space.

    These include green peppers, tomatoes, cucumbers (黄瓜), carrots, lettuce and wheat. Even on China's first manned spacecraft Shenzhou—V, there were some seeds from Taiwan.

    "Conditions in outer space such as radiation (辐射) and low gravity can cause big changes in the seeds," said Chinese researcher Jin Xing.

    But not all seeds are better after going to space. After returning to the Earth, the best seeds are selected. These seeds produce (生产) much more and also grow faster than normal (正常的) seeds

    One American university uses a robot as a teacher to help students with their problems. And none of the students knew that was a robot at the beginning!

    Jill Watson, a robot made in that university, helps the students a lot. When answering their questions, Jill seems to be an excellent teacher. She can give wonderful answers quickly. She sounds natural and usually says good words.

    When someone told the students that their "teacher" was a robot, they all got very surprised.

    "How was it possible? I was talking to a robot?" said Bailey, "She sounds like a common teacher." Another student Jennifer told the newspaper, "We are thinking about choosing Jill Watson to be our best teacher. She is really helpful,"

    Now many students like to ask questions on their school's website. It usually takes teachers too much time to answer them. So the university had such an idea of making Jill Watson. It's a faster way to help the students with their problems.

    Jill can quickly find possible answers in her own computer to the questions and make sure they are all right. After that, she tells the students in an electronic voice that sounds like a famous actress.