Enamel is hardest substance in the human body.
61
A human being loses an average of 40 to 100 strands of hair a day.
133
Human hair and fingernails continue to grow after death.
7
The human eye blinks an average of 4,200,000 times a year.
233
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
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
A person can live without food for about a month, but only about a week without water.
156