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Jem demonstrates what a calorie is, Dr Yan tests the ability of MPs to calculate risk, and Liz investigates whether we are running out of antibiotics and what will happen if we do.
The team take on more scientific challenges. Dallas goes supersonic and meets the team behind a 1000mph car, Jem tests some homemade glues and Dr Yan puzzles commuters.
On the 50th anniversary of the invention of the laser, Jem Stansfield explains how they work and builds himself one. Dallas Campbell looks at the rise of Citizen Science.