In the average lifetime a person will breath in about 44 pounds of dust.
21
Your heart rate can rise as much as 30% during a yawn.
69
About 400 different kinds of microbes live on and in the human body.
-3
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
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
When your face blushes, the lining of your stomach turns red, too.
154
The average human body contains enough fat to make seven bars of soap.
45
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55