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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Illicit drug use costs the United States approximately $181 billion every year.

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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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