What We Didn't Know About The Penis

Most people tend to assume that science is "done" when it comes to human anatomy. I mean, we've been studying it for THOUSANDS of years. We've dissected dead humans, cut millions of them open every year and fix things while they're still alive. We have advanced technology that can peer inside the living human body. What can there POSSIBLY be left to discover?

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Well, quite a lot as it turns out. As Diane Kelly tells us in this great TED Talk, we still have a lot to learn about basic human anatomy. One example: how does the male erection work?