June 4

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  1472: Aztec philosopher, warrior, architect, poet, and ruler Nezahualcoyotl dies. He had an experience of an "Unknown, Unknowable Lord of Everywhere" to whom he built an entirely empty temple in which no blood sacrifices of any kind were allowed.

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  1739: Scientist and author Johann Beckmann born. Beckmann will coin the word technology, meaning the science of trades, and be the first to teach technology and write about it as an academic subject.

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  1769: Astronomer Guillaume Le Gentil's hopes are dashed when, after years of struggle, overcast conditions prevent him from making a critical observation.

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  1783: The Montgolfier brothers give first public demonstration of balloon flight.

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  1944: World War Two: A hunter-killer group of the United States Navy captures the German submarine U-505: The first time a U.S. Navy vessel had captured an enemy vessel at sea since the 19th century.

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  1992: Mathematician Melvin Dresher (Dreszer) dies. He contributed to game theory, co-developing the game theoretical model of cooperation and conflict known as the Prisoner's dilemma.