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Why does the moon follow us when
What is an asteroid?
How was the Grand Canyon formed?
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actually ancient ancient Egypt animals armadillo bacteria became began believed birds blood cells body bones brain bread called carbon carbon dioxide catfish cause century chemical coffee color copper cotton countries creatures cuttlefish dandy horse developed diamond disease earth eggs Egyptians England Europe example extra-sensory perception eyes fact feet fibers fish germs glands glass Greeks grow hair hay fever heat horse important inches infection invented isinglass kind known legs lemurs liquid live marble marsupials material means Middle Ages miles milk modern molecules mollusks move muscles ocean organs peanuts person phosphorus pipes plants poison polio porpoise pounds probably produce protoplasm rock Romans salamander salt seeds shell skin slide rule soap sometimes species stone substance sugar surface tapeworm teeth temperature things thousands tiny tissue tree United usually wood word