Helium Shortage, Radiation and Airport Security - S5.E7 - Bang Goes the Theory
Dallas investigates a potential global helium shortage, Dr Yan tests shoppers on how much they know about radiation, and Liz tries out the new airport security technology that can see beneath your clothes.
Helium Shortage, Radiation and Airport Security - S5.E7 - Bang Goes the Theory
September 26, 2011
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