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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Thyroid conditions may make getting pregnant impossible.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.