Early American humans hunted car-size armadillos and used their shells for houses.
12
The world's shortest man measures only 21.5 inches.
73
Your fingernails grow faster in summer.
744
The human sigh acts as a physiological reset button.
23
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
The average person will go on a date at least 100 times before they finally marry.
33
Poor eyesight (myopia) is associated with higher IQ.
232
