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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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There are more bacteria in your mouth than there are people in the world.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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There are 20 feet of blood vessels in each square inch of human skin.
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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.