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Approximately 500,000 babies are born each year in the United States to teenage mothers.
Blood is approximately twice as thick as water because of the cells and other components found in it.
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.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.