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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Illicit drug use costs the United States approximately $181 billion every year.
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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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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.