Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Human hair and fingernails continue to grow after death.
7
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
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Tigers can see 6 times better at night than humans.
305
Only humans shed emotional tears.
331
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139