"Lost Posture: Why Indigenous Cultures Don't Have Back Pain"
http://www.npr.org/sections/goatsandsoda/2015/06/08/412314701/lost-posture-why-indigenous-cultures-dont-have-back-pain
"Back pain is a tricky beast. Most Americans will at some point have a problem with their backs. And for an unlucky third, treatments won't work, and the problem will become chronic.
Believe it or not, there are a few cultures in the world where back pain hardly exists. One indigenous tribe in central India reported essentially none. And the discs in their backs showed little signs of degeneration as people aged."
Turns out that the S-shaped spine is unnatural and detrimental. Go figure.
