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
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
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The human brain has the capacity to store everything that you experience.
4k
You can't tickle yourself.
29
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197