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Jem Stansfield takes to the air with the Royal Navy to explain how helicopters work, while Liz Bonnin tests brain-training devices.
Jem Stansfield attempts to defeat the US Navy's latest weapon with no more than some foam and a crash helmet, while zoologist Liz Bonnin gets in contact with her frog brain.
Jem Stansfield tests new braking systems, Liz Bonnin looks into the origins of speech and Dallas takes part in a sea race with Dame Ellen MacArthur.