The first patented condom was meant to be reused!
47
The heart pumps about 1 million barrels of blood during an average lifetime!
30
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
The human brain is insensitive to pain.
76
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
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
The pupil of the eye expands as much as 45 percent when a person looks at something pleasing.
130
If you stop working out, it takes twice as long to lose strength than it took to gain it.
16