The human body is full of surprises. For example, when I get enough sleep, drink water, and eat healthy, I feel.... good?! It surprises me every single time it happens, which is about twice a year.
Seriously though, these flesh sacks that carry us through the world are full of magical and bizarre functions that most of us aren't even aware of. And once you learn them, you may never look at your body the same way again.
In a popular Reddit thread, someone asked: "What is a fact about the human body that not many people know about?"
1.) From bathroomkiller:
we have a fifth valve in our hearts that seals up right after we’re born. Apparently anything similar to that afterwards is a huge surgical procedure. The human body is amazing.