Things you'd never know if you didn't have children around

A king size waterbed holds enough water to fill a 2000 sq. ft. house 4 inches deep.
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A ceiling fan can hit a baseball a long way.
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 The glass in windows (even double-pane) doesn't stop a baseball hit by a ceiling fan.
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You hear:  "uh-oh"  quite often after toilet flushing
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Brake fluid mixed with Clorox makes smoke
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Play dough and microwaves do not mix
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just how well superglue holds
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Pool filters do not like Jell-O
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always look in oven before turning it on
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Cats throw up twice their body if you make them dizzy.