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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

The light reactions and chemiosmosis: the organization of the thylakoid membrane. The light reactions and chemiosmosis: the organization of the thylakoid membrane.
Asthma. (a) A normal bronchiole. (b) An asthmatic bronchiole. During an asthma “attack,” the bronchi Asthma. (a) A normal bronchiole. (b) An asthmatic bronchiole. During an asthma “attack,” the bronchi
Raster is the best scope position to view the spark lines of all the cylinders to check for ... Raster is the best scope position to view the spark lines of all the cylinders to check for ...
Display is the only position to view the firing lines of all cylinders. Cylinder 1 is displayed on ... Display is the only position to view the firing lines of all cylinders. Cylinder 1 is displayed on ...
Lines of the posterior thorax Lines of the posterior thorax
Resting Membrane Potential Resting Membrane Potential
Video: Covalent bonds - role in the body

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