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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

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The average office desk has 400 times more bacteria on it than a toilet.

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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

A hair is an array of many α-keratin filaments, made up of the substructures A hair is an array of many α-keratin filaments, made up of the substructures
The nucleic acids DNA and RNA are made from chains of nucleotides. The nucleic acids DNA and RNA are made from chains of nucleotides.
Principles in older adult learning Principles in older adult learning
An example of a commercial spill kit. An example of a commercial spill kit.
Healthier choices can be made when time is taken to read a nutrition label. Healthier choices can be made when time is taken to read a nutrition label.
Video: Generalized life cycles for plants and animals Animation

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