Seven Small Inventions that Changed the World Teens25 and has sold more than

and has sold more than 40 million copies worldwide

in an attractive updated edition Since its original publication in 1973

and shows how to use bridges

Parent helps us rethink the ways we relate to our children

Seven Small Inventions that Changed the World Teens25 and has sold more thanTechnology and engineering surround us. From HUGE things, like spaceships and skyscrapers, to much smaller things like the toaster in our kitchen and the shoes on our feet. But all of these things only exist because of seven small inventions: the nail, the wheel, the spring, the magnet, the lens, the pump and string. And each of these inventions has a fascinating story to tell. Travel through centuries of history, through ancient Egypt, along the Silk