Quote:
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Originally Posted by Dirty Dane
Without doubt these:
weapons
money
the plow
penicillin
bicycle
combustion engine
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Money is another that wasn't truly an invention, but rather an evolvement of trading things. If I grew and traded apples and you grew and traded oranges and someone else grew and traded watermelons, eventually they all figured it would be easier just to trade metals to represent a specific value for exchanging things.