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...world-wide is synthetic. The development of synthetic rubbers in Western Europe and the USA was accelerated by the demands of the Second World War and the associated loss of access to the natural rubber plantations in the Far East. Today's engineers have a complete spectrum of synthetic rubbers available to them, with properties ranging from the general-purpose to the...

...world. Regulators apply what is known as the de minimis concept, which assumes that there is a level of risk that is so low it can be reasonably ignored. Its name is derived from the common law maxim de minimis non curat lex: ‘the law does not concern itself with trifles’. A one-in-a-million level of increased risk over a lifetime is often used as a reasonable...

...world objects, illustrations are used in technology courses to explain those objects, and also to help you to ‘visualise’ the ideas connected with those objects...Seeing the light: Your home’s orientation - Activity 12 Your home’s orientation Timing: Allow about 1 hour The purpose of this activity is to help you to work out how well the place where you live has...

...world, than have been translated or even catalogued. It is only a small proportion of these that have been shown to have mathematical content, perhaps five hundred or so, compared with the several hundred thousand extant tablets. The results of studying these emerged in the 1920s and 1930s, and led to a considerable re-evaluation of the Babylonians, who within a decade...