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Did you know?
Your heart beats over 36 million times a year.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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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.