Pisa's Leaning Tower, Eider Down, Chocolate Digestive

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How Do They Do It?
23rd October 2017 22 mins Season 15 Episode 5

It's been tipping over for 800 years - what's the gravity-defying magic behind Pisa's leaning tower? And, how are chocolate digestive biscuits manufactured?

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Parchment, Shuttlecocks, Salt still
Season 15 · Episode 6

Parchment, Shuttlecocks, Salt

How did the ancient Greeks invent parchment with techniques still used today? And how do they make shuttlecocks, the fasting moving object in sport?
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