1. This is what skulls of people who still have their baby teeth look like.
2.Here's what the roots of a wisdom tooth look like.
3. And here's what the teeth of people with mulberry molars look like.
4.This is what getting goosebumps looks like close up.
5.Here's what it looks like when an iris starts growing over your pupil (aka persistent pupillary membrane, or PPM).
6.And here's what it looks like to have a collapsed iris.
7.If you've ever wondered what a human with a tail would look like, here's a baby who was actually born with one.
8.There's a condition called dermographism, or dermatographia, where, if you scratch at your skin or even sometimes just apply pressure, you have an allergic reaction. This means you can essentially spell or draw things on your skin, as seen below.
9.You may have heard about polydactyls before, especially in reference to cats that have an extra toe (or finger) or two. But did you know humans can be polydactyls too?
10.There's also mirror hand syndrome, where you have two hands (minus the thumbs) for the price of one.
11.There's yet another condition where your thumb has three phalanges instead of two, causing it to be much longer than normal.
12.Lots of people (including yours truly) deal with Raynaud's phenomenon, where blood flow is restricted and doesn't reach extremities well. This can cause your fingers to be an entirely different color — you can see it on a single finger below.
13.No, this isn't the eye of a high-quality humanoid robot. This is what eyes look like after getting surgery to replace a diseased cornea with an artificial cornea.
14.And here's what electrical burns on your eyes would look like — basically stars on your eyes.
15.We don't really have to deal with the plague anymore, but this guy who contracted bubonic, pneumonic, and septicemic plague might give you a good idea of what it was like.
16.Here's what the inside of a human bone looks like.
17.And here's what a cross section of your spinal cord looks like.
18. This is what a major close-up of a human eye looks like.
19. This is what it looks like for ink to spread over skin.
20.This is what a teratoma — a tumor that can grow teeth, eyes, hair, etc. — looks like.
21.And another one with hair.
22.Hey, want me to ruin your day? Turns out it's possible for hair to grow out of your eye.
23.This is what having a parasitic twin looks like. In case you didn't know, this is a rare condition (and type of teratoma) in which one twin continues developing normally, but the other stops developing, and some of its body remains in the first twin's body. Usually, the extra parts are removed much closer to the birth of the viable child, but here's what it looks like on an older child.
24. This is what TWO parasitic twins growing inside someone's skull looks like.
@OGdukeneurosurg / Twitter / Via Twitter: @OGdukeneurosurg