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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.