You can't tickle yourself.
29
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Only humans shed emotional tears.
331
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
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
Babies crawl an average of 200m a day.
212
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62