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 skeleton keeps growing until you are about 35, then you start to shrink.
74
The average human body contains enough iron to make a small nail.
50
From the age of thirty, humans gradually begin to shrink in size.
1
There is a disease called ichthyosis that turns the skin scaly like a fish.
90
There are about 1,400 different species of bacteria in your belly button.
10
If you are bitten by a poisonous snake, and fail to receive medical attention, you still have a 50% chance of survival.
28
Brain freeze is caused by the brain sensing the drop of temperature on your palate and increasing blood pressure in an attempt to save you from freezing.
14