How Do They Do It?

S15, EP5 "Leaning Tower of Pisa, Eider Down and Digestive Biscuits"

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Engineers look at Pisa's gravity-defying tower that has been tipping for 800 years; a lucky duck is unharmed while its down is used in the world's most-expensive duvets; a factory reveals the gastronomic genius behind a teatime accompaniment.

Original Air Date: Nov 16, 2018Science22m

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