logo

Video encyclopedia

Flashback calendar

Albert Einstein and Leó Szilárd patent refrigerator

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 patented it in the U.S. on November 11, 1930. This is an alternative design from the original invention of 1922 by the Swedish inventors Baltzar von Platen and Carl Munters.

Birth of Calculus

German mathematician Gottfried Wilhelm Leibniz showed how to find an area under the graph of the mathematical function. This day is often commemorated as the birth of calculus. However, there is also a great controversy. English mathematician and physicist Isaac Newton invented calculus in a roughly same time. It is impossible to decide who was first.

Anniversaries of the (in)famous

born 1961

Yuri Milner

born 1872

Maude Adams

died 1994

Bob Miner