The human body is an incredible machine. But it's far from perfect. For all our evolutionary brilliance, we're still stuck with joints that wear out, dandruff, and sinuses that seem designed for misery. And that's just the beginning!

In various places on the internet, people have been sharing the body's most frustrating design flaws, so we decided to compile their "reviews" of the not-so-user-friendly features. And who knows—if we're lucky, maybe we'll receive a patch upgrade. Something bionic would be nice.

How close the food pipe and wind pipe are.

That we can bite the insides of our own cheeks. I'm sure plently of you know the pain of accidentally biting down on your cheek.

Periods. Most other animals who have a menstruation cycle, or something like it, reabsorb the uterine lining r

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