SCIENCE
BILL NYE THE SCIENCE GUY: http://www.billnye.com/
EARTH (recycling, weather, facts about Earth, etc.): http://www.planetpals.com/
SCIENCE NEWS FOR KIDS: http://www.sciencenewsforkids.org/
FUNOLOGY (fun with Science): http://www.funology.com/
EXTREME SCIENCE: http://www.extremescience.net/
INFARED ZOO ANIMALS (see, in infared light, how animals use their body parts to adapt): http://coolcosmos.ipac.caltech.edu/image_galleries/ir_zoo/
MATH
FUN BRAIN: http://www.funbrain.com/
COOL MATH: http://www.coolmath.com/
BRAIN BASHERS: http://www.brainbashers.com/
AAA MATH: http://www.aaamath.com/
GEOMETRY: http://homepage.mac.com/efithian/geometry.html