Of course I tend to not think about why but just understands that it happens.  But now that I think of it I'm getting a nagging feeling that I'll have to know this stuff for ap physics.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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