A history of ingenuity

Humans are an ingenious species. Though we've been on the planet for a relatively short amount of time (Earth is 4.5 billion years ol...

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The wheel

Before the invention of the wheel in 3500 B.C., humans were severely limited in how much stuff we could transport over land, and how far. ...

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The nail

Without nails, civilization would surely crumble. This key invention dates back more than 2,000 years to the Ancient Roman period, and be...

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