The world's shortest man measures only 21.5 inches.
73
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Your thumb is about the same size as your nose.
124
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Early American humans hunted car-size armadillos and used their shells for houses.
12
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