Early American humans hunted car-size armadillos and used their shells for houses.
12
Only humans shed emotional tears.
331
The human eye blinks an average of 4,200,000 times a year.
233
You forget 90% of your dreams.
256
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
The average sperm cell swims at 8 inches per hour.
4
A person can live without food for about a month, but only about a week without water.
156