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Following the earthquake and tsunami in Japan, we discuss what is causing problems at the nuclear reactors in Fukushima. Explains the relevance of hydrogen, iodine, boron and zirconium.

Impossible objects, like those drawn by artist M. C. Escher, don't seem like they could exist in the real world. But Kokichi Sugihara from Meiji University in Kawasaki, Japan, is well known for building 3D versions of these structures.

Japan's Nuclear Crisis Explained in Four Minutes with clear graphics about the workings of the reactors.