Where in the World?

The sun’s boundary lines

Do you know why most globes are tilted on their stands? It’s because the earth is tilted. Because of this tilt, different places on earth get different amounts of sunlight. Special lines on globes…

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Plant Ways

Why some trees stay green all winter

The kinds of trees that people use as Christmas trees are called “evergreens.” Evergreen trees are “ever green.” They don’t change color and lose all their leaves in autumn as other trees do. The…

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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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