Do we do AMAs?
It's actually the same reason for both, a loss of technique. Do a google image search for 'toddler squat'. Coming out - coming up - from a heels-UP squat will freakin' kill your knees. Back pain: again a technique problem. They took groups of people with chronic back pain and tested the effectiveness of an array of treatments. The group that recovered most effectivity and with the greatest longevity - the group that was very simply taught to deadlift. Not pulling powerlifting / competition weight - but technique and everyday weight. It's all about body mechanics.
Actually, the PacNW US as well. It comes down to one thing - compassion. The virtue that leads to empathy and sympathy. Not "rules of courtesy", but valuing the experience of the other person, realizing theirs is as real and complex and important as your own. Google 'sonder'.
Time is FASCINATING!!! Spacetime is a single construct, right? And RELATIVE! Which is crazy enough. But here's the question on time: Why do WE experience it LINEARLY?!? Do you know how many questions we could answer if we knew why we experience 1/2 of a single thing relatively and the other half linearly? Crazypants.
Dunno. The single, fundamental question of physics is "Why is there something instead of nothing?" It's why theoretical physics is such a mindphuk.