We know the mosquito very well. Mosquitoes fly everywhere. They can be found almost all over the world, and there are more, than 2, 500 kinds of them.

No one likes the mosquito. But the mosquito may decide that she loves you. She? Yes, she. It's true that male mosquito doesn't bite and only the female mosquito bites because she needs blood to lay eggs. She is always looking for things or people she wants to bite. If she likes what she finds, she bites. But if she doesn't like your blood, she will turn to someone else for more delicious blood. Next time a mosquito bites you, just remember you are chosen. You're different from the others!

    If the mosquito likes you, she lands on your body without letting you know. She bites you so quickly and quietly that you may not feel anything different. After she bites, you will have an itch(痒) on your body because she puts something from her mouth together with your blood. By the time the itching begins, and she has flown away.

And then what happens? Well, after her delicious dinner, the mosquito feels tired. She just wants to find a place to have a good rest. There, on a leaf or a wall, she begins to lay eggs, hundreds of eggs.

    Lockheed Martin, American space system company (空间系统公司) has found a really cool way to inspire the young minds of today to the research fields in Science, Technology, Engineering and Math (STEM).

    It may look like a normal yellow bus, but all the magic happens once you get inside. Meet the “Mars (火星) Experience Bus,” part of Lockheed Martin's new “Generation Beyond” national education program to get the kids joining in studying what goes on outside of our home planet. The bus offers a virtual reality (VR, 虚拟现实) experience making the teenagers feel like they are driving on Mars.

    The VR experience was developed by taking advantage of software (软件) created for today's best video games, so you can imagine the picture shown is top level. The kids do seem really excited to see the bus take a virtual trip on the red planet and search unknown places. It's certainly a great way of learning about the universe by virtual reality working on a common bus.

    The Lockheed Martin's bus will start a tour in the United States to allow kids from different parts of the country to take a ride in it. The Generation Beyond project also includes an iPhone app for iOS providing real-time information about weather reports for Mars, and there's also a free deep space course for middle school teachers and students.

    Why don't birds get lost on their long flights (飞行) from one place to another? Scientists have studied this puzzle for a long time. Now they're starting to fill in the blanks(空白).

    Not long ago, experiments showed that birds use the sun to guide them during daylight hours. How do birds fly at night? Tests with artificial stars, which are made by people, have proved that certain night-flying birds are able to follow the stars in their long-distance flights.

    They found a bird that spent its lifetime in a cage and never flew under a natural sky. But it was born with the ability to use the stars to look for the direction. This bird's cage was placed under the sky filled with artificial stars. Any change in the position of the artificial stars caused a change in the direction of the bird's flight. From the experiment, they found that the bird tried to fly in the same direction as those artificial stars moving under the natural sky.

    But the stars are of course birds' main ways of navigation (航行), when the stars are hidden by clouds, they can still find their way by such landmarks (路标) as river courses, mountain ranges (山脉), coast lines and so on. Because of this ability, people use the dove (鸽子) to send messages in some fields. For example, the doves were used to send messages in both World War I and World War II. During that time, thousands of doves were used to carry important messages in order to save the lives of many thousands of people. So it is also the symbol of peace.

    But when it's too dark to see these things, the doves are not able to find their way. They only circle helplessly and get lost.

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    When some plates(板块)of the Earth move suddenly, an earthquake happens. Many earthquakes begin under the sea. Earthquakes may happen anywhere on the Earth. They often happen near the mountains.

    During an earthquake, the shakings make rocks rise suddenly and even crack(断裂) open. Houses fall down. People are killed or hurt, and sometimes the whole villages or cities are destroyed.

    Can we do something to keep ourselves safe from earthquakes? Scientists have studied earthquakes and made maps that show the “earthquake belt（带）”. In area of these belts, it's possible for earthquakes to happen. In these areas we should build strong houses to fight against earthquakes.

    In the future, Scientists will be able to tell when and where an earthquake will attack before it happens. They can also tell people what to do and how to deal with it.