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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Your heart beats over 36 million times a year.
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Thyroid conditions may make getting pregnant impossible.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.