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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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There are 60,000 miles of blood vessels in every adult human.
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There are more sensory neurons in the tongue than in any other part of the body.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.