Every hour one billion cells in the body must be replaced.
17
More people have a phobia of frogs than rats.
41
Fingernails grow fastest on the hand you favor.
44
When you look up at the blue sky and see white dots flying around, you’re actually seeing your own white blood cells.
30
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
A human being loses an average of 40 to 100 strands of hair a day.
133
Kissing an infection-free partner is good for your teeth!
141
Your ribs move about 5 million times a year, every time you breathe!
60