Donald William
GRAY
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Born: 29 January 1939 in Rochester, New York, USA
Donald William GRAY died 29 August 1994
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Postcards and Memories of Rochester, New York, USA
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Birth — 193929 January 1939
Rochester, New York, USA
1940 - April - 1st electron microscope demonstrated (RCA), Philadelphia, Pennsylvania, USA The microwave oven was invented accidentally in 1945 by Percy Spencer, a Raytheon engineer. While testing a magnetron, he noticed microwaves melted a candy bar in his pocket. Experimenting further, he discovered microwaves could cook food quickly. Raytheon patented the process, and by 1947, they built the first commercial microwave oven, called the 'Radarange.' Initially used in commercial settings, microwaves becomes affordable for home use by the 1960s and 1970s, revolutionizing cooking. The cell phone was invented by Martin Cooper of Motorola. On April 3, 1973, he made the first handheld mobile phone call with the Motorola DynaTAC. This device weighed 2.5 pounds and was 10 inches long, offering 30 minutes of talk time and requiring 10 hours to charge. The first commercial cell phone was released in 1983, revolutionizing communication and leading to the modern smartphones we use today.
1981 - June 5 - First reported case of AIDS (Acquired Immune Deficiency Syndrome) 1989 - The World Wide Web is invented at CERN (Tim Berners-Lee, UK)Record added: 1/8/2026 3:43:44 PM
Last updated: 1/8/2026 3:43:44 PM
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