Here’s a couple of Science videos that I nearly always show on my IWB in Science training day. They are fun clips to use in Science lessons. All are taken from the TV Show Brainiac.
Jon Tickle Walks on Custard
As well as those, here are a few more places to get some good videos
Loads of videos on this page: http://www.theodoregray.com/PeriodicTable/Stories/011.2/
An excellent site that collates good science videos on the Internet.
Periodic Table of Videos