Your heart will pump about 212 million liters in its lifetime.
26
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
On average, there's 100 billion neurons in the human brain.
83
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
