Tony and George were painting freely. Each of them had a bottle of blue paint(油漆)and a bottle of yellow paint.

Suddenly George said, “Look, Tony, I made green!”

“How did you do it?” asked Tony.

“I put yellow paint on top of my blue paint-yellow and blue put together make green!”shouted George. Other children came around to watch and wanted to do it themselves.

This is an example of discovery learning or hands-on learning.

People remember things better when they learn then by doing. Here is an example. How will you learn to play football?

Buy a book and read about how to play football or buy a video about football? Or go to the playground and ask person to teach you?

Which way will help you learn the game best? Learning on the playground is the best way for most people because they try the game and learn the rules as they play. They learn in a hands on way.

Hands-on learning is good for children. The learner takes an active part in it instead of just sitting and listening. This is the way that we want our children to learn. In order to learn best, children must take an active part in hands-on activities every day. Some good examples of hands-on activities are working puzzles, painting, playing simple board games together and so on.

Many people don’t really know how to get a real friendship and why their friendship can’t last for long. Here are some suggestions on how to get a real friendship and keep it.

You may know that a real friend always tries to meet with his friends, no matter how busy he is or how far away he lives. 【小题1】 A real friend is a treasure. You shouldn’t ignore your friends just because you are not in the same city. Real friend is in your heart.

Nobody likes people who always tell him how to do this or that. 【小题2】 So before you make friend you have to decide who you want to be your friends. Most people like to have friends who like to do the same kinds of things as they do. When you find your friend is quite different, you can accept your friends.

【小题3】 And try your best to keep it if you made one. Because once you break your promise, it's hard to win your friends' trust again.

A real friend should be ready to offer help to his friends. 【小题4】 Your friends need it even if it is as small as a few words of encouragement or a smile.

【小题5】 I think you can easily get a real friendship. Remind each other that friendship is more important. A simple reminder of how special the friendship is will go a long way to soften a hard heart.

Our lives have become more digital in the modern world. We can study, find information and communicate with friends through computers and phones. However, spending a lot of time working, reading, texting and playing games through digital devices （数码设备）is bad for our eyes.

According to the Optometric Association （验光协会）, 70% to 75% of computer workers have eye problems.

Digital eyestrain （眼睛疲劳）is one of the most common problems. People with digital eyestrain may get headaches, dry and red eyes, eye pain, watering and other problems.

“These problems have started to increase among children. Children get cellphones at younger ages and are using them very often during the day.” Sarah Hinkley, spokeswoman for the Association, told the situation to us.

The good news is that there are many things you can do to reduce digital eyestrain.

When using a computer, first sit in your chair and reach out your arm. Your hand should rest comfortably on the screen, as if you’re high-fiving the screen. Increase text size until your eyes feel comfortable.

When you are using a mobile phone, keep it at least 30 cm from your eyes and just below eye level. Try not to use it under sunlight.

Remember to take a 20—20—20 break: every 20 minutes, take a 20-second break and look at something 20 feet（about 6 metres） away.