i would get a 55mW, no laser will make them fall over in pain, they all acually hurt the same, but higher powered lasers take less time. go with a 55 if you really want to do that, but remember, the teacher will be able to see the beam all the way back to you
dont worry, your computer is a lot better than the laptop my dad had, get a job and start buying stuff
he still constantly calls me no matter where i am and asks stupid computer questons
how did you get to that thing? i serioulsy have never see it before?