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Blood is approximately twice as thick as water because of the cells and other components found in it.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
There are more bacteria in your mouth than there are people in the world.
If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.
Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.