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Vaccines prevent between 2.5 and 4 million deaths every year.

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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

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There are 60,000 miles of blood vessels in every adult human.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

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