When was glass invented?

verry tricky question. i chose naturally occuring, because it does. even if the answer was wrong, the explanation states that people were using naturally occuring glass :) . now indeed the naturally occuring glass wasn't "invented"...i got tricked :)

Space, no need to shout. Relax. Player #29529575 is pointing out glass is naturally occurring as per the explanation. I guess the phonecians figured out how to replicate this process to order. Is that an invention or a discovery?

lightning strikes, on sand, produce glass. Also I wonder whether lava, other metamorphic actions, does not produce it.

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I think they meant the obsidian thing and not just glass itself