The loudest? In his new book Extreme Cosmos (Perigee, 2012), astronomer Bryan Gaensler reveals the cosmic record holders of these and many other titles. In an excerpt below, from the chapter Extremes of Temperature, Gaensler explains the physics behind some of the hottest stars known:
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If your allergic reactions are severe, your doctor may ask you to keep a journal that details your symptoms and the substances that appear to cause them. Your doctor may want to order tests to determine whatâs causing your allergy. The most commonly ordered types of allergy tests are: skin tests; challenge (elimination-type) tests; blood tests