Discovery kids - Games, videos, exploration and a very good Facebook feed with current events.
The Science Museum - the best science museum in the world lets you explore and discover parts on line.
Extreme Science - find the biggest, baddest and best in the world of science!
Kids Gardening - the science of getting out in the garden and growing!
Planet Pals - discover more about our planet and how to help to keep it green.
Science for Kids - a great site from New Zealand.
Science made simple - get active with these great science projects that can be done at home.
Strange science - a history of paleontology and biology.