Fun
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Compound interest
This site has lots of interesting infographics, mostly on chemistry topics, this link takes you to the biology tag.
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Edheads
Detailed interactive activities, including various operations and transplants.
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Game for science
Interactive Science-based game.
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Hollywood science
Website of the recent BBC2 series where presenters try out science from Hollywood movies
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Housing a forest blog
This blog has lots of creative science type ideas that can be done at home.
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How stuff works
Site explaining how stuff works!