The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
If your DNA was stretched out it would reach to the moon 6,000 times.
256
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The human sigh acts as a physiological reset button.
23