Bug Highway:
How much fresh water is left on earth?
Another video of the Japanese quake.And all things radioactive: Caesium fallout from Fukushima rivals Chernobyl.
Why are there so many different ways of measuring radiation?
Workers at Japan's quake-hit nuclear plant are trying to prevent radioactive water from seeping into the sea.
Tom Tomorrow helps explain it all.
The radioactive ocean that we've been using as a bomb site and dumping ground:
Radioactive pollution in the ocean is nothing new. We've been loosing the stuff offshore since 1944.
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