3 ms·

I don’t think they lived long enough for it to be a problem.

• cubefox 3y ago
  They were a lot longer outside than modern people though.
  • antisthenes 3y ago
    Outside != full sun. Sitting in tree shade won't give you skin cancer.
    • insanitybit 3y ago
      How much UVA/UVB gets filtered out from shade under a tree? And how much vitamin D are we getting to make sitting in the shade worthwhile?