Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
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
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
32
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11