How Things Work

The shape of a screw

Wham! Wham! Wham! All it takes to nail two pieces of wood together is a few strong hits with a hammer. But fastening two pieces of wood together with a screw is a lot harder. The screw has to be…

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Learning with Childcraft

Organization of Childcraft

The first three volumes of Childcraft introduce children to liter­ature from all ages and from around the world. In Volumes 4 through 14, children learn about living things, about machines and…

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About Me

Bumps, bruises, and blisters

One clay, I got in a fight with another boy and bruised my eye. Sometimes I bump my ankle or my leg or my elbow. The bump pushes a muscle against a bone, and tiny veins and arteries break. I have a…

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