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There are approximately 3 million unintended pregnancies in the United States each year.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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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.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.