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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Thyroid conditions may make getting pregnant impossible.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.