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There are 20 feet of blood vessels in each square inch of human skin.
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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.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.