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A short history of nearly everythingHydrogen gas, on the other hand, is extremely combustible, as the dirigible Hindenburg demonstrated on May 6, 1937, in Lakehurst, New Jersey, when its hydrogen fuel burst explosively into flame, killing thirty-six people. 32 If you have ever been struck by how beautifully crisp and well defined the edges of cumulus clouds tend to be, while other clouds are more blurry, the explanation is that in a cumulus cloud there is a pronounced boundary between the moist interior of the cloud and the dry air beyond it. Any water molecule that strays beyond the edge of the cloud is immediately zapped by the dry air beyond, allowing the cloud to keep its fine edge. Much higher cirrus clouds are composed of ice, and the zone between the edge of the cloud and the air beyond is not so clearly delineated, which is why they tend to be blurry at the edges. 33 The term means a number of things to different people, it appears. In November 2002, Carl Wunsch of MIT published a report in Science, БЂњWhat Is the Thermohaline Circulation?,БЂ«in which he noted that the expression has been used in leading journals to signify at least seven different phenomena (circulation at the abyssal level, circulation driven by differences in density or buoyancy, БЂњmeridional overturning circulation of mass,БЂ«and so on)-though all have to do with ocean circulations and the transfer of heat, the cautiously vague and embracing sense in which I have employed it here. 34 The indigestible parts of giant squid, in particular their beaks, accumulate in sperm whalesБЂ™ stomachs into the substance known as ambergris, which is used as a fixative in perfumes ...» | Код для вставки книги в блог HTML
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