James Watt（詹姆期 瓦特） was an English boy. He liked to ask questions and think hard. One day he was sitting in the kitchen with his grand mother, there he saw a kettle on the fire Soon steam began to come out o the kettle（水壶）. The lid was shaking.
"Grandma, what's in the kettle" he asked.
"Water, my boy, nothing but water"
" But I know there is something che. It pushed the lid（盖子）up".
"Oh, thats only steam.”
How did the steam get under the lid comes from the hot water.
The boy said to himself, How strong the steam is！ It can push things. If there is more water, the steam must be much stronger.
For many years, James watt tried to make steam woik for people. He made the first steam engine（蒸气机） for the world.