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Only 5% ace this amazing human body quiz - Can you?

The human body is a wondrous thing. We have incredible speed, power, endurance - yet most of us really don't know all that much about it. Take this quiz to see how much you really know about that sack you walk around in every day.

There are 20 questions. Once you're done, share your results to wow all your friends!

Suzanne Morss
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