The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
If your DNA was stretched out it would reach to the moon 6,000 times.
256
Obsessive nose picking is called Rhinotillexomania.
101
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Gorillas can catch human colds and other illnesses.
205
The human sigh acts as a physiological reset button.
23
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24