actually, RSI's (repetitive stress injuries) can be very serious. I had a professor last year who wears hand braces on both hands from typing so much... and he uses overhead projectors and markers instead of a chalkboard because of the repetitive motions on his shoulders... I even had to get acupuncture for my right hand (played too much Quake, seriously) and it still isn't back at 100%. It got so bad this past summer that I had to drop my compiler class that I was taking UCI. So it's not a laughing matter. When people first think of an injury from using the computer they automatically assume carpal tunnel, which in many cases is not true.