Albert Einstein is probably most remembered by the public for his General Theory of Relativity, but how many remember his 1930 invention of a refrigerator that used no electricity? The idea was great, it operated without electricity, using ammonia, butane and water. The principle being that water boils at a much lower temperature at high altitudes where air pressure is lower than it does when you’re at sea level, where air pressure is higher.Malcom McCulloch, an electrical engineer at Oxford University in the U.K., is leading a team in a three year project to produce appliances that can be [more]
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