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
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Mushrooms are more closely related to humans than they are to plants.
47
The average person will go on a date at least 100 times before they finally marry.
33
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15