Eyelid hole
If you tug your upper or lower eyelid away from your eye, you’ll see a tiny hole in the inner corner called the lacrimal punctum. It’s easiest to spot on your lower eyelid, but both help drain your tears. Don’t miss these other strange body parts and their surprising purposes.
The sometimes-missing arm muscle
About 86 percent of humans have a palmaris longus muscle running from the elbow to the palm. To test if you have it, touch your pinky to your thumb and tighten your wrist muscles. The muscle will pop out in the center of your wrist, right under your palm. In humans, it helps wrist flexibility, but there’s no consequence if you’re born without one or if a surgeon removes it. Scientists think the muscle is probably used to help primates grip and swing through trees.