Most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it's chance in a million.

    People have made a survey to colors of more than four thousand kinds of flowers and discovered that only eight of them are black.

    As we know, sunlight is formed by seven colored lights. The wavelength of each light is also different, so the quantity(量) of heat in each light is also different. Flowers, especially their petals(花瓣), are easy to be harmed by high temperature.

    Black flowers can take in the light of all the wavelengths that make them dry up because of high temperature, so black flowers can hardly resist(抵抗) sunlight. But red, orange and yellow flowers can protect themselves from sunlight by reflecting(反射) the red light, orange light and yellow light, each of which has a large quantity of heat.

    A computer program that could help catch and ever translates from aliens in outer space has been started by a British scientist.

    If aliens are discovered one day, scientists fear their language may make it possible to understand them. But John Elliott of needs Metropolitan University in Britain has come up with a program that can figure out the structure(结构)of their language. He thinks that's the first step in understanding what they are saying.

    Dr. Elliott's program would compare an alien language to a database (数据库)of 60 different languages in the world to look for a similar structure. He believes that even an alien language will have its own structure. Language has to be structured in a certain way, or it will be harder to use, he told New Scientist magazine.

    Research had shown that it is possible to know if a signal(信号)carries a language rather than a picture or music. Dr. Elliott has gone a step further by finding a way to pick out what might be words and sentences. Because languages have different word orders, Dr. Elliott has set up a library of the sentence structures of 60 human languages.

    If a message is received from outer space, it could be compared against this database. Scientist would then be able to see if ti's similar to any human language, or a mix of the language.

    However, Dr. Elliott also said that in order to translate what the aliens are actually saying, it may still be necessary to have a code book.

    Have you ever wished that your life was like a reality TV show(真人秀节目)? Well, like it or not, things might be this way in the future.

    This is because of Google glasses. Glasses are the latest technology from Google. They have more exciting features(特征)than you could possibly imagine.

    For one thing, people who wear the glasses can shoot videos and record the sounds around them. So if your friend is wearing Google glasses, he or she can record your every move and broadcast live on the Internet for the world to see.

    There is a GPS system in the glasses. So if you get lost you can say" OK, Glass, where am I?", and it will find where you are and tell you where you need to 90.

    Google glasses are a bit like a helpful secretary. You can tell them what you want to write in an e—mail and they will type it for you.

    Since April 16, Google glasses have been on the market in small numbers. But by the end of the year anyone will be able to buy a pair for about 2, 500 yuan.

    Some people are not sure whether they find Google glasses cool or not. When someone is wearing Google glasses, it is not easy to see whether or not they are using them.

Museums are active centers of learning. In a science museum, people can learn about nature and technology as well as physics and chemistry. Visiting museums is a good choice to spend a holiday for people of all ages. But there're some rules when visiting museums. Take an art museum, for example.

Keep quiet. You can talk, but keep the voice down and be polite to those around you. You should turn off your phone or put it on silent. Sounds from your phone may disturb (打扰) others. If a call must be made, you should go outside to make it. 

Ask before taking photos. Some museums welcome visitors to photograph or videotape works of art. However, please be careful with the sign "no photography" which means taking photos is not allowed for that work or exhibition. If you take photos without permission, you will be in trouble. Maybe you will be punished. 

Do not touch works of art! Your touch may not seem like much, but even the slightest (最轻的) touch can damage the surface of a painting, discolor stone, and even rust metal. Keep a safe distance between you and each work of art. This helps to avoid accidental touching.

Never bring food or drinks into the museum. It's no good eating or drinking there. The art in the museum will provide plenty of food for thought as well as a dinner for the eyes!

Running and pushing are not allowed in the museum. Proper museum behavior is necessary to avoid accidentally hitting or damaging works of art.

Remember: ____. If you obey them, you will surely enjoy yourself in the museum.

Scientists say that hobbies can make kids cleverer, healthier and even more successful when they grow up. How?

When you have a hobby, you learn new things. You have to read instructions (说明书). You look at websites, magazines and books to get more information about your hobby. More reading makes you a better reader and a better learner. 

For many hobbies, such as building model cars and making pottery (陶器), you have to use your brain as well as your hands. We learn by doing things and by touching things. These kinds of activities make people more creative (有创造力的). 

Having a hobby makes you feel good. Scientists say, "When you make something, the feel good part of your brain gets a message. It makes you feel happy. " When we feel happy, we have less stress(压力). Too much stress can make people ill. 

People with hobbies learn how to make goals and solve problems. Learning these skills when you are young can help you when you grow up. For some kids, having a hobby can be the first step to find a better job in the future.