When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
If your DNA was stretched out it would reach to the moon 6,000 times.
256
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
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
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22