Yawns are more contagious among people with closer relationships.
163
The human body contains over a billion miles of DNA.
147
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
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
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