You can't tickle yourself.
29
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
The average person's skin weighs twice as much as their brain.
131
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Obsessive nose picking is called Rhinotillexomania.
101
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
It takes about 20 seconds for a red blood cell to circle the whole body.
102