On average, there's 100 billion neurons in the human brain.
83
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
Fingernails grow fastest on the hand you favor.
44
There are about 1,400 different species of bacteria in your belly button.
10
Men have larger hearts; women's hearts beat faster.
77
2 out of 3 adults in the United States have hemorrhoids.
7
A hard working adult sweats up to 4 gallons per day. Most of the sweat evaporates before a person realizes it's there, though!
25
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6