On average, there's 100 billion neurons in the human brain.
83
The human eye blinks an average of 4,200,000 times a year.
233
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Mushrooms are more closely related to humans than they are to plants.
47
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Obsessive nose picking is called Rhinotillexomania.
101