Machines work for us to make life easier. The wheel- a wonderful, simple device that rolls smoothly along- is a machine. So is a jumbo jet, which is really thousands of machines linked together to speed us around the world.
The first machines were powered by hand. Then we used animals and the energy of wind and water.
In today's world, many machines need electricity to do jobs that range from telling the time to building skyscrapers.
|Used book||Used book, excellent condition|
|Age interest||6-11 years|
|Dimensions (cm) L X W||28 x 22|
How Machines Work- Disney The Wonderful World of Knowledge
- Product Code:Antikvár- Used books: Science, 6-11 years
- Availability:In Stock