Yawns are more contagious among people with closer relationships.
163
You forget 90% of your dreams.
256
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
The average person's skin weighs twice as much as their brain.
131
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
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
Your fingernails grow faster in summer.
744