[saas_sam]

Maybe we didn't! I recall reading about Egyptians using jasmine and rice-based sunscreen.

We survived winters without fur. Perhaps sunscreen isn't much different. Mud slathered on our bodies to avoid painful sunburns in Summer could've worked fine for 300,000 years just as animal hide and straw worked to avoid freezing to death in Winter.

But there may be more to it. I wonder if the intensity of the Sun and/or the strength of Earth's magnetic field could fluctuate more than current science has been able to determine.

[sasaf5]

Also all kind of hats and clothing to protect from the sun. Desert dwellers wrapped themselves as best as they could.