We can’t really use the wind until we catch it. And what’s the most popular way to catch
the wind’s force? A windmill of course, which can do the work of many people. Inside the mill, a pole begins to spin. It goes all the way down into the mill. There it can do some pretty helpful things: It can turn a big stone wheel to crush grain. It can move a saw up and down to cut logs into lumber. It can pull up water from underground, which can be used to water crops.
For more fun with wind and solar power for kids (including a do-it-yourself solar-powered car), see Green Power Solar & Wind Power by Peter Lerangis at amazon.com.