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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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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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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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How to find the domain of a function (Part 2) How to find the domain of a function (Part 2)
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Video: Mitosis step-by-step

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