The human eye blinks an average of 4,200,000 times a year.
233
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
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
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
A human being loses an average of 40 to 100 strands of hair a day.
133