Translation is the communication of the meaning of a source-language text by means of an equivalent target-language text. The English language draws a terminological distinction (not all languages do) between translating (a written text) and interpreting (oral or sign-language communication between users of different languages); under this distinction, translation can begin only after the appearance of writing within a language community.
Heating, ventilation and air conditioning (HVAC) systems account for approximately 35 % of the total energy spent in residential and commercial buildings. New nanotechnology will significantly reduce this massive energy use.
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