How were the first cave paintings made?

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It seems that Upper Palaeolithic humans were tagging walls before it was cool to do so:

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Thanks for sharing. I’m going to use this in my chemistry class.

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And perhaps in your human origins class. The “Great Leap Forward” in human cognition is pretty evident at 40,000 years ago. When I look at the painting, I see humans just like me.

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Great idea!