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.
Did you know?
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.
Did you know?
There are more bacteria in your mouth than there are people in the world.
John Muir
The Scopes Trial: William Jennings Bryan (right) represented the state of Tennessee, and Clarence Da
This engraving by William Russell Birch shows Congress Hall (left), which was occupied by Congress f
John Locke (1632‑1704) was a British philosopher and physician who laid the groundwork for an ...