1# When you look at an object, the image of that object appears upside down on your retina. However, your brain automatically corrects for this, allowing you to perceive the object the right side up.
2# Like fingerprints, every person has a unique tongue print.
3# The human body contains 30 000 billion red blood cells.
4# Baby are born with the ability to smile.
5# During your lifetime, you will produce enough saliva to fill two swimming pools. Saliva plays an important part in beginning the digestive process and keeping the mouth lubricated, and your mouth produces quite a bit of it on a daily basis.
6# Babies are always born with blue eyes. The color of your eyes depends on the genes you get from your parents, but at birth most babies appear to have blue eyes. The reason behind this is the pigment melanin. The melanin in a newborn’s eyes often needs time after birth to be fully deposited or to be darkened by exposure to ultraviolet light, later revealing the baby’s true eye color.
7# After eating too much, your hearing is less sharp.
8# By the age of 60, most people will have lost about half their taste buds. Perhaps you shouldn't trust your grandma’s cooking as much as you do. Older individuals tend to lose their ability to taste, and many find that they need much more intense flavoring in order to be able to fully appreciate a dish.
9# If you squeezed out all of the bacteria from your intestines, you could almost fill up a coffee mug.
10# If you squeezed out all of the bacteria from your intestines, you could almost fill up a coffee mug.
11# The acid in your stomach, that which helps digest your food, is strong enough to dissolve razor blades! Don’t try swallowing metal objects to prove this, but hydrochloric acid (found in the stomach) can dissolve a variety of metals.
12# Everyone has a unique smell, except for identical twins.
13# Ketchup was sold in the 1830s as medicine.
14# We are about 1 cm taller in the morning than in the evening. The cartilage between our bones gets compressed by standing, sitting and other daily activities as the day goes on, making us just a little shorter at the end of the day than at the beginning.
15# The tooth is the only part of the human body that can’t repair itself. If you've ever chipped a tooth you know just how sadly true this one is. The outer layer of the tooth is enamel which is not a living tissue. Since it’s not alive, it can’t repair itself, leaving your dentist to do the work instead.
16# The colder the room you sleep in, the better the chances are that you’ll have a bad dream. It isn’t entirely clear to scientists why this is the case, but if you are opposed to having nightmares you might want to keep yourself a little toastier at night.
17# Your ears secrete more earwax when you are afraid than when you aren't. The chemicals and hormones released when you are afraid could be having unseen effects on your body in the form of earwax. Studies have suggested that fear causes the ears to produce more of the sticky substance, though the reasons are not yet clear.
18# Right-handed people live, on average, nine years longer than left-handed people do. This doesn't have a genetic basis, but is largely due to the fact that a majority of the machines and tools we use on a daily basis are designed for those who are right handed, making them somewhat dangerous for lefties to use and resulting in thousands of accidents and deaths each year.
19# It is believed that the main purpose of eyebrows is to keep sweat out of the eyes.
20# Thumb has the same length as nose
21# Heart disease, hypertension and diabetes are major silent killer diseases.
Declare the past, diagnose the present, foretell the future.