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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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 60,000 miles of blood vessels in every adult human.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.