in reply to Since I began using computers, I have hurt my:
Chances for a decent tan
What, you don't like my pasty blue glow?
Besides, the only reason I don't have a tan anymore is because of the switch to LCDs -- they used to refer to my office as 'the tanning booth', because I kept appropriating all of the spare monitors (my office was a former machine room that had been partially repurposed as a storage closet)
... and I've never hurt my grades from using computers. Or a desk chair. The rest of them, however, probably.