On average, there's 100 billion neurons in the human brain.
83
Poor eyesight (myopia) is associated with higher IQ.
232
The human eye blinks an average of 4,200,000 times a year.
233
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
By weight, Bone is five times stronger than steel.
417
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
The human brain doesn't stop developing until about 25 years old.
102