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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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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.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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