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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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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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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.

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Video: Dorsal Recumbent Position

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