A computer can get very hot when it works on a lot of programs. It can cost a lot to cool the computer. So some scientists want to know what would happen if the heat from the computer could be used.

    Large Internet companies such as Google and Microsoft have thousands of computers. As these computers deal with information， they produce lots of heat， so they need huge cooling systems. These systems send the heat into the air.

    A company in Holland thinks paying to make the computers work and then paying again to cool them are a waste of energy. So the company developed a special device—the e-Radiator.

    Boaz Leupe， head of the company， says that e-Radiator works as a heating system and saves money. He explains that the energy is used twice—once to heat the home and once to cool the computer and that the users don't have to pay to cool their computers.

    Five homeowners in Holland are testing the heating system in their homes.

    “We pay for the computer using， so， in that way， homeowners get heating for free.” Boaz says.

    Jan Visser is one of the homeowners. “If you use the computer more， the e-Radiator producers more heat，” he says， “It cannot provide enough heat if you don't use your computer often.” But he is ready to try it. It's a great help for his family.

    The company says e-Radiators produce heat temperatures of up to 55℃. It says the system could save its users about $440 a year.

Surprising Camara.

    WATCH out! A slingshot(弹弓) is aimed at you. But don't be afraid. It's just a camara. It's called Slingshot Camara. The camara will catch your Surprised look. Pull the rubberhand(橡皮筋)back and shoot. It takes a Picture. Two designers from South Korea made's.

Making Use of Smog

    SMOG(雾霾)is annoying. But what if it could be made into a diamond(钻石)? A “Smog Free Tower” will try to do that, although the diamonds will not be as real ones. Black particles(颗粒)in smog and diamonds are mostly carbon. A designer from the Netherlands made the tower.

New Flower Home

    WHEN plants get too big, you have to move them from a small flowerpot to a big one. Now, the special Growth Flowerpot can save you time and energy. It's made of a special materal in origami style. It gets bigger and bigger as the plant grows. It is from Belgium.

Easy Bike Parking

    PARKING a bike is not easy in big cities. Here comes the bicycle-parking tower. You only need to use a card and push a button. Then the tower can hold your bike in an empty place inside it. You don't even need to lock the bike.

Solar Charged Light

    YOU can put it in your pocket. But if it's inflated(充气), it turns into a light! This is LumnAID, a solar light that can be on for 16 hours after recharging(充电) with just seven hours of sunlight. Two US students designed it.

    Smog(雾霾) is a big problem in many Chinese cities. But it seems that besides wearing a mask, few of us know what has caused the smog and what to do to beat it. Chai Jing, a former news hostess with China Central Television, discussed the questions in her documentary Under the Dome.

    The 103 - minute film was published on major Chinese video - sharing websites on Feb 28. In the film, Chai visits polluted places and talks to officials and scientists. She comes to the conclusion that burning too much coal and oil are the main causes of PM2.5 and smog.

    To make things worse, according to Chai, the coal and oil we are burning is of poor quality and don't meet the standards for environmental protection. Therefore they have produced more harmful gas to pollute the air.

    To solve the problem, Chai suggests that we should clean our coal and oil or replace them with cleaner energy such as natural gas. In her film, Chai also pointed out that ordinary people can do something to help control smog too. For example, we live a greener life by using more public traffic. Or if we see things that could harm the environment, we can try to stop it. In one scene from the film, Chai sees a dirt mound in a building site exposed in the air, and asks the person in charge to cover it. When she sees a restaurant cooking without any suitable filter facilities, she calls the hotline 12369. The restaurant installed the filter a week later.

    Chen Jining, the new minister of environmental protection, praised Chai. "This film encourages ordinary people to care about the environment. This is what we need in the future. "

    Twenty years ago in Costa Rica, three girls found a baby sloth（树懒）on a road. The little animal's mother was killed by a car. These girls took the baby sloth to Judy, the owner of a hotel. Judy wanted to help, but she didn't know how to look after the sloth, so she called the zoo. With the help of the zoo, Judy took good care of the baby sloth. She named the baby sloth Buttercup.

    After her success, more people brought Judy wounded sloths or baby sloths they found. Judy then opened a rescue centre（救助中心）. Today, the rescue centre has saved more than 500 sloths. Sloths live in the forests of Central America and South America. They hang on to the trees with  their claws（爪子）. There are two main types of sloths. You can tell them apart by the number of their claws. Sloths hardly move. They spend most of their time sleeping in the trees.

    But now, with the increase of population, human beings（人类）cause a lot of problems for these slow and quiet animals. The main problems is that the forests are becoming smaller and smaller. When trees are cut down, sloths will fall and break themselves. Sloths who live near human beings sometimes are hit by cars or attacked by dogs.

    At the centre, workers care for the injured animals. Their goal is to help the sloths return to the wild when are healthy enough.