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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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.
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On average, the stomach produces 2 L of hydrochloric acid per day.