When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
By weight, Bone is five times stronger than steel.
417
It takes about 20 seconds for a red blood cell to circle the whole body.
102
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Your thumb is about the same size as your nose.
124
Our Right Lungs takes more air than our left lung.
194