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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

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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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Thyroid conditions may make getting pregnant impossible.

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There are more bacteria in your mouth than there are people in the world.

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