About 400 different kinds of microbes live on and in the human body.
-3
Like fingerprints, everyone's tongue print is different!
71
You mostly breathe from only one nostril at a time!
75
Unlike dogs, pigs, and some other mammals, humans cannot taste water. They taste only the chemicals and impurities in the water.
95
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
It is almost impossible to sneeze with your eyes open. It is a defense mechanism that has evolved to protect our eyes from bacteria and debris.
164
Men have larger hearts; women's hearts beat faster.
77
Fingernails grow nearly 4 times faster than toenails.
31