There are about 1,400 different species of bacteria in your belly button.
10
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
Your thumb is about the same size as your nose.
124
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
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17