It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The human brain doesn't stop developing until about 25 years old.
102
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The human body contains over a billion miles of DNA.
147
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Babies crawl an average of 200m a day.
212
It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
218