An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
In one day, adult lungs move about 10,000 litres of air.
11
The human eye blinks an average of 4,200,000 times a year.
233
You can't tickle yourself.
29
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The human sigh acts as a physiological reset button.
23
A man's beard grows fastest when he anticipates sex.
239
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23