Jem makes his own diamonds and then proves they aren't forever, Dr Yan explains the secret science of popcorn, and Dallas meets the team that hope to cure breast cancer...In the aftermath of the Fukushima radiation scare, the team turns its attention to nuclear power. Jem climbs into a reaction chamber to explain how a nuclear power station works and what happened in Japan. Meanwhile, Dallas investigates the clean-up operation for radioactive waste, and Liz looks at what radiation does to the human body...
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