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The refrigerator mother theory, also known as Bettelheim's theory of autism, is a largely abandoned psychological fringe theory that the cause of autism is a lack of parental, and in particular, maternal emotional warmth. Evidence against the refrigerator mother theory began in the late 1970s, with twin studies suggesting a genetic etiology, as ...
Kelvinator ad from 1920 Kelvinator refrigerator, c. 1926. The enterprise was established on September 18, 1914, in Detroit, Michigan, United States, by engineer Nathaniel B. Wales, who introduced his idea for a practical electric refrigeration unit for the home to Edmund Copeland and Arnold Goss.
The history of the personal computer as a mass-market consumer electronic device began with the microcomputer revolution of the 1970s. A personal computer is one intended for interactive individual use, as opposed to a mainframe computer where the end user's requests are filtered through operating staff, or a time-sharing system in which one large processor is shared by many individuals.
Globally. Food in a refrigerator with its door open. A refrigerator, commonly fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room ...
Icebox used in cafés of Paris in the late 1800s. An icebox (also called a cold closet) is a compact non-mechanical refrigerator which was a common early-twentieth-century kitchen appliance before the development of safely powered refrigeration devices.
An absorption refrigerator is a refrigerator that uses a heat source to provide the energy needed to drive the cooling process. Solar energy, burning a fossil fuel, waste heat from factories, and district heating systems are examples of convenient heat sources that can be used. An absorption refrigerator uses two coolants: the first coolant ...
Einstein's and Szilárd's patent application. Annotated patent drawing. The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd, who ...
Source: Bureau of Economic Analysis. The 1973–1975 recession or 1970s recession was a period of economic stagnation in much of the Western world during the 1970s, putting an end to the overall post–World War II economic expansion. It differed from many previous recessions by involving stagflation, in which high unemployment and high ...