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6 Inventions That Are Older Than You Think

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From steam engines, to contact lenses, to biometric security based on someone's voice, there are a lot of inventions out there that are older than you think.

Hosted by: Hank Green (he/him)
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Sources: https://docs.google.com/document/d/1HeZvv7csKAugBC5XogZ2AUBYqlPHenFIal5Oh-uuF10/pub
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