5. There are no muscles in your fingers.
Weird, right? You can obviously move them, but there aren’t muscles within the fingers themselves.
Instead, the muscles that allow you to move your fingers are located in your palm and forearm.
Even though they don’t have muscles, the fingers are incredibly powerful.
Research has found that your fingers can detect ridges as small as 13 nanometers in height on an otherwise smooth surface. To put that in perspective, if your finger was the size of the Earth, you’d be able to feel the difference between the bumps formed by houses and the bumps formed by cars on the planet’s surface.
6. The bones in your forearm cross when you twist your wrist.
There are two bones in your forearm (the ulna and the radius) that run parallel to one another. But rotating your arm causes the bones to cross one another.
You might not think this is crazy, but go ahead and twist your arm a couple times and this will probably freak you out a bit.
7. If you flick your nipple, it will become hard in roughly seven seconds.
Yes, this is really true.
Probably not something to try at work, though.
8. When a patient receives a kidney transplant, doctors leave the old kidney in place.
The new kidney is placed in the lower front part of the abdomen, in the pelvis.
You already knew that each person has unique fingerprints, but that’s not the only unique print on the human body!