It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
By weight, Bone is five times stronger than steel.
417
The average sperm cell swims at 8 inches per hour.
4
You can't tickle yourself.
29
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
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Our brains have a negativity bias and will remember bad memories more than good ones.
15