How much do you actually know about your own body and how it works? Which organs do what, or what surprising discoveries science has made along the way?

Well, now’s your chance to find out. We’ve rounded up some curious facts and fascinating tidbits from the Facebook page Medical Journal Daily. Scroll down to see how many you already knew and how many will catch you off guard. And of course, don’t forget to upvote your favorites as you go. Enjoy!

Click here & follow us for more lists, facts, and stories.

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