Human Mysteries

Some of theseĀ  I already knew; about the lungs, the number of bones in the feet, and about saliva.

Human Mysteries Part 1
The Human Body is a treasure trove of mysteries, one that still confounds
doctors and scientists about the details of its working. It’s not an
overstatement to say that every part of your body is a miracle. Here are
facts about your body, some of which may leave you stunne d.
1. It’s possible for your body to survive without a surprisingly large fraction
of its internal organs. Even if you lose your stomach, your spleen, 75% of
your liver, 80% of your intestines, one kidney, one lung, and virtually every
organ from your pelvic and groin area, you wouldn’t be very healthy, but you
would live.
2. During your lifetime, you will produce enough saliva to fill two swimming
pools. Actually, Saliva is more important than you realize. If your saliva
cannot dissolve something, you cannot taste it.
3. The largest cell in the human body is the female egg and the smallest is
the male sperm. The egg is actually the only cell in the body that is visible
by the naked eye.
4. The strongest muscle in the human body is the tongue and the hardest
bone is the jawbone.
5. Human feet have 52 bones, accounting for one quarter of all the human
body’s bones.
6. Feet have 500,000 sweat glands and can produce more than a pint of
sweat a day.
7. The acid in your stomach is strong enough to dissolve razor blades. The
reason it doesn’t eat away at your stomach is that the cells of your stomach
wall renew themselves so frequently that you get a new stomach lining every
three to four days.
8. The human lungs contain approximately 2,400 kilometers (1,500 mi) of
airways and 300 to 500 million hollow cavities, having a total surface area
of about 70 square meters, roughly the same area as one side of a tennis
court. Furthermore, if all of the capillaries that surround the lung cavities
were unwound and laid end to end, they would extend for about 992
kilometers. Also, your left lung is smaller than your right lung to make room
for your heart.
9. Sneezes regularly exceed 100 mph, while coughs clock in at about 60 mph.
10. Your body gives off enough heat in 30 minutes to bring half a gallon of
water to a boil.
11. Your body has enough iron in it to make a nail 3 inches long.
12. Earwax production is necessary for good ear health. It protects the
delicate inner ear from bacteria, fungus, dirt and even insects. It also cleans
and lubricates the ear canal.