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 man's beard grows fastest when he anticipates sex.
239
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
It takes about 20 seconds for a red blood cell to circle the whole body.
102
By weight, Bone is five times stronger than steel.
417
Your hair grows faster in the morning than at any other time of day.
91
When your face blushes, the lining of your stomach turns red, too.
154