With the powerful science's working, the world has changed quite a lot. People used to grow things by themselves, so they not only had to endure the terrible sunshine ,but also the horrible rain. People used to chat with each other by writing letters or face to face.

But nowadays, we have hundreds of different kinds of machines help us to do all kinds of hard, dirty works. They can spread or plant seeds for us, cook food for us and clean up the rooms for us. That's not over, we can talk with each other by using the mobile phones and relax ourselves by playing computers. Computers can subtract, multiply and divide the numbers. In a flash, a computer can do a calculation that we couldn't do in our whole lifetime, that really helped us a lot.

All of the things above, is the good use of the science. It is really convenient and helpful. Also the development of science in the future need us.