Whoever invented glass was a genius.
How do you come up with the idea to invent glass? Hey, here's a bunch of sand. I wonder if I heat it way the hell up, it will turn into a clear substance I can make containers and windows with. Did one person invent it, and then it spread around the world from that point? Or did multiple people around the world invent it independently?
This question brought to you by some weak brownies, a dab, and some Chem D.