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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

The extent of acid rain in the United States has decreased. The extent of acid rain in the United States has decreased.
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Video: Molecules, Membrane Permeability and Structure

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