SCIENCE PAGES
http://www.big.uk.com/ some pretty wacky (and dangerous!) experiments
http://www.madscience.org/ An American site, but has a few interesting experiments
http://www.eecs.umich.edu/mathscience/funexperiments//quickndirty/alphalist.html alphabetical list of science activities
http://www.physics.isu.edu/physdemos/ Physics demos from Idaho State University
Single lens simulated experiments with lenses