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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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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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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

MacArthur and Wilson's theory of island biogeography. MacArthur and Wilson's theory of island biogeography.
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Explaining “Moving Continents”— The Theory of Plate Tectonics Explaining “Moving Continents”— The Theory of Plate Tectonics
Proposed relationships between living and fossil platyrrhines and catarrhines. Proposed relationships between living and fossil platyrrhines and catarrhines.
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The four identity statuses proposed by Marcia, based on Erikson's theory The four identity statuses proposed by Marcia, based on Erikson's theory
Video: What are Taste Receptors? How Does it Work? Animation

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