Rocks, Stones, and Petrified Bones

The money minerals

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…

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Mathemagic

Solving problems

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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