Humans are weird. Full stop. For this list, well be looking at the most bewildering human innate behaviours, body parts, and attributes that scientists have yet to explain. Our countdown includes Yawning, Blood Types, Microbes, and more! Whats your favorite medical mystery? Be sure to share with us in the comments below!

Watch more great science videos here:
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Top 10 Biggest Scientific Discoveries of 2020: https://youtu.be/2WxR_2-faYY
Top 20 Biggest Scientific Discoveries of the Decade: https://youtu.be/tIvtkMRFj-Q

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