The average person produces enough saliva in their lifetime to fill 2 swimming pools.
Human ovaries contain over 500,000 immature eggs, but only about 400 get to mature.
There are more than 300,000,000 blood capillaries in your lungs and if they were stretched out tip to tip they would reach approximately the distance of 3700 Kilometers which like the 7.7 times the distance between Mombasa to Nairobi.
There are 2.5 trillion (give or take) of red blood cells in your body at any moment. To maintain this number, about two and a half million new ones need to be produced every second by your bone marrow. That is about half the population of Nairobi every second! * Every 20 seconds, your red blood cells do a complete circuite of your body. The average red blood cell lives for 120 days.
Considering all the tissues and cells in your body, 25 million new cells are being produced each second.
Beards are the fastest growing hairs on the human body. If the average man never trimmed his beard, it would grow to nearly 10 meters long in his lifetime.