Enamel is hardest substance in the human body.
61
Flu shots only work about 70% of the time.
18
If your DNA was stretched out it would reach to the moon 6,000 times.
256
India used to be the richest country in the world until the British invasion in the early 17th Century.
37
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
Clinophobia is the fear of beds!
30
Your heart rate can rise as much as 30% during a yawn.
69
Pain travels through your body at 350 ft. per second.
36