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TIL In perfecting the design of their first aircraft, the Wright Brothers built and tested prototypes inside of a Wind Tunnel - to which they credited the bulk of their aircraft’s success.

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a8A1y TIL When you look into a Hadza mouth there's 20 back teeth while the rest of us tend to have 16 erupted and working. Hadza also typically have a tip-to-tip bite between the upper and lower front teeth, the edges of their lowers align to form a flawless arch. The size of Hadza teeth match perfectly.
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