Another reason YouTube should be allowed into schools. The Periodic Table of Videos is just one of 10 free online resources for science teachers posted ib Mashable. Check out this one, created by a group of scientists at the University of Nottingham who demonstrate what happens when you hold a match to a balloon filled with hydrogen. (The group also puts out a non-YouTube version of the site for schools that have blocked the site.)
http://www.youtube.com/watch?v=6rdmpx39PRk&feature=player_embedded#!