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Did you know?
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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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On average, the stomach produces 2 L of hydrochloric acid per day.
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.