Your heart rate can rise as much as 30% during a yawn.
69
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Fingernails grow nearly 4 times faster than toenails!
30
On average, there's 100 billion neurons in the human brain.
83
The brain can stay alive for 4 to 6 minutes without oxygen. After that cells begin die.
193
The right lung takes in more air than the left.
30
Sex burns about 360 calories per hour.
860
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127