Your heart will pump about 212 million liters in its lifetime.
26
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
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 human brain is more active during sleep than during the day.
28
Only humans shed emotional tears.
331
Tigers can see 6 times better at night than humans.
305
Yawns are more contagious among people with closer relationships.
163
The average person will go on a date at least 100 times before they finally marry.
33