In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
Which do you think is most at work in a debate contest, mastery- or performance-goal orientations or ...
The U.S. Department of Agriculture offers the SuperTracker tool to help you track, analyze, and plan ...