Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The average person's skin weighs twice as much as their brain.
131
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
On average, there's 100 billion neurons in the human brain.
83
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73