It takes about 20 seconds for a red blood cell to circle the whole body.
102
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The average sperm cell swims at 8 inches per hour.
4
Your thumb is about the same size as your nose.
124
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
If the human eye was a digital camera, it would have 576 megapixels.
25
There are about 255 babies born worldwide every minute.
46