Yawns are more contagious among people with closer relationships.
163
On average, there's 100 billion neurons in the human brain.
83
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The human body contains over a billion miles of DNA.
147
Poor eyesight (myopia) is associated with higher IQ.
232
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Babies crawl an average of 200m a day.
212