Enamel is hardest substance in the human body.
61
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
About 400 different kinds of microbes live on and in the human body.
-3
The average person has over 1,460 dreams a year!
69
When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44
Panophobia is the fear of everything.
52