It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The average person's skin weighs twice as much as their brain.
131
If your DNA was stretched out it would reach to the moon 6,000 times.
256
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
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
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130