On average, there's 100 billion neurons in the human brain.
83
Poor eyesight (myopia) is associated with higher IQ.
232
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26