Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
A person can live without food for about a month, but only about a week without water.
156
In one day, adult lungs move about 10,000 litres of air.
11
There's 100 trillion good bacteria living in your body.
17
A human being loses an average of 40 to 100 strands of hair a day.
133
The human brain doesn't stop developing until about 25 years old.
102
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Your heart will pump about 212 million liters in its lifetime.
26