Tigers can see 6 times better at night than humans.
305
The world's shortest man measures only 21.5 inches.
73
Only humans shed emotional tears.
331
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
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The human body contains over a billion miles of DNA.
147