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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.