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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 human body produces and destroys 15 million blood cells every second.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Video: Embryonic development - Weeks 5 to 8

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