The average person's skin weighs twice as much as their brain.
131
One human hair can support 3 ounces.
191
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Tigers can see 6 times better at night than humans.
305
The average sperm cell swims at 8 inches per hour.
4
Human hair and fingernails continue to grow after death.
7
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14