Our brains have a negativity bias and will remember bad memories more than good ones.
15
Every human spent about half an hour as a single cell.
144
Pain occurs when sounds are above 130 db.
124
The human brain doesn't stop developing until about 25 years old.
102
Only humans shed emotional tears.
331
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11