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
Your tongue is the only muscle in your body that is attached at only one end.
173
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
Men have larger hearts; women's hearts beat faster.
77
The average human body contains enough fat to make seven bars of soap.
45
When your face blushes, the lining of your stomach turns red, too.
154
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
The whiter your tongue, the more germs there are on it.
88