Your heart rate can rise as much as 30% during a yawn.
69
Enamel is hardest substance in the human body.
61
It takes about 20 seconds for a red blood cell to circle the whole body.
102
The right lung takes in more air than the left.
30
Within three days of death, the enzymes that once digested your food begin to eat you.
22
The human body contains over a billion miles of DNA.
147
By weight, Bone is five times stronger than steel.
417
The average person has over 1,460 dreams a year!
69