Human hair and fingernails continue to grow after death.
7
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Research has determined that most people are happiest at 7:26pm on a Saturday night.
70
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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