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How long, how fast, how hot, how heavy?

So many measures!

Which weighs more, a pound of feathers or a pound of gold? You probably said, “Ha, you can’t fool me! A pound is a pound. They both weigh the same!” Sorry, you’re wrong. A pound of feathers weighs…

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About Animals

Animals of Long Ago

Imagine animals like fish with legs. Imagine trees like giant feather dusters. That’s what some animals and trees looked like, once. Just as you change as you grow older, the world changes and the…

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