Your fingernails grow faster in summer.
744
Tigers can see 6 times better at night than humans.
305
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The human brain doesn't stop developing until about 25 years old.
102
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22