Probably one of Sarah Paine's lectures.
HobbitFoot
It depends on the sport. There are sports where people absolutely play through injuries. Hell, the NFL only recently implemented a concussion protocol.
Those aren't conservative ideas!
Yeah. I'm getting too high up in the corporate ladder for my liking.
Quitting
Scrambled eggs.
I usually like to put things in my scrambled eggs, though.
It depends on what you want to do when you go back to school.
If you're switching careers, I'd put the early 40's as a limit unless the career has age limitations.
If you're getting a degree to enhance your existing career, I'd put the early 50's as a limit unless you intend to not retire immediately.
If you just want the degree, there isn't really a limit.
I'd look to see if there is anything you could do with your experience which would take up less of your time. A side job with retirement income could be better than sticking with your current job.
Also, it depends on what your plan is when you retire. If you don't have an idea about what you'd do with your time, you might want to keep working.
China has a far weaker social safety net than a lot of people assume.
Cam girls and pornography are sex work too.
Of all the strange engineering charts and graphs I saw, the weirdest ones were in geotechnical engineering.