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Fire, then domestication of animals, then agriculture, then maybe the wheel. The wheel was only good once animals were domesticated and the new world didn't have any candidates.The zipper?
Toilet?
Glass?
Condom?
_________ you tell me
The zipper?
Toilet?
Glass?
Condom?
_________ you tell me
Its like I don't even know you people...
Sliced bread
The zipper?
Toilet?
Glass?
Condom?
_________ you tell me
What was the greatest invention of all time? ...
Bathroom tissue.
Indoor plumbing.Bathroom tissue.
If you're going to go that route, I might say soap instead or maybe deodorant!