Many trees that live where winters are freezing cold lose their leaves each fall. Leaves make the food that keeps a tree alive. But to make food, and to stay alive themselves, leaves need water. A…
Gold is a bright-yellow metal that looks like sunlight turned to stone. Silver is a pale-gray metal that looks like frozen moonlight. These two minerals are so beautiful and hard to find that people…
Mathematicians used computers to help plan and launch this space shuttle. Far, far above the blue and white globe of the Earth, a strange machine, shaped much like a windmill, rushes out into the…
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