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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.