using one's education

I've been searching for a replacement for the rucksack I've been using for years (possibly decades). I still use it almost every day (textbooks, groceries, whatever) but one of the straps is about to go and there are holes and worn spots. It apparently is impossible to find another bag that is just a large empty space without all sorts of zippers and pockets and stuff. The other irritation is that I've found some online that I'd like to try but they aren't available in any local stores, including one LL Bean one that the local store used to carry but no longer does - it's online only now. Saturday we were at REI. I found one that was too fancy but mostly OK, and discovered that it was a kid's pack, so the hip belt (as I thought of it) hit me at about waist level, even after all the possible adjustments. I asked where the belt was supposed to be, and the guy helping us said "at the iliac crest." Wow. I know where that is, but a year ago I wouldn't have. Are bone names supposed to be common knowledge?
(http://en.wikipedia.org/wiki/Image:Pelvis_diagram.png)

martial arts physics

Even though they are weird animated fighters instead of real people, I find this hard to watch (like almost anything violent), but I am entertained by the fact that formulae appear superimposed.
http://www.youtube.com/watch?v=PlrTazGeYeI&NR=1