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Did you know?
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
The average adult has about 21 square feet of skin.
Did you know?
The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.