100 Greatest Inventions

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Arts & Philosophy

Number 48 - Postal Systems and Email

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Number 49 - Calculus

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Musings at 50

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Number 50 - Cotton Gin

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Number 51 - The Piano

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Number 52 - Bridges

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Number 53 - AI

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Bonus Episode 1: Calenders

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Number 54 - The United Kingdom

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Number 55 - The Telegraph

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