It takes about 20 seconds for a red blood cell to circle the whole body.
102
Yawns are more contagious among people with closer relationships.
163
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The average person will go on a date at least 100 times before they finally marry.
33
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456