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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Cyanide works by making the human body unable to use oxygen.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.