The average person's skin weighs twice as much as their brain.
131
Your thumb is about the same size as your nose.
124
Enamel is hardest substance in the human body.
61
One human hair can support 3 ounces.
191
The human brain doesn't stop developing until about 25 years old.
102
The average sperm cell swims at 8 inches per hour.
76
The human body contains over a billion miles of DNA.
147
The largest cell in the human body is the female egg and the smallest is the male sperm.
682