After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Your heart will pump about 212 million liters in its lifetime.
26
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
The human eye blinks an average of 4,200,000 times a year.
233
Gorillas can catch human colds and other illnesses.
205