Enamel is hardest substance in the human body.
61
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
The human sigh acts as a physiological reset button.
23
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
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The human brain doesn't stop developing until about 25 years old.
102
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
Only humans shed emotional tears.
331