The human sigh acts as a physiological reset button.
23
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
Early American humans hunted car-size armadillos and used their shells for houses.
12
The average person's skin weighs twice as much as their brain.
131
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
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
The average sperm cell swims at 8 inches per hour.
4
Human hair and fingernails continue to grow after death.
7