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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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Video: Mitosis step-by-step

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