Muriel Lois
KNOWLES
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Born: 9 July 1932 in Bangor, Maine, USA
Muriel Lois KNOWLES died 17 September 1999
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Birth — 19329 July 1932
Bangor, Maine, USA
1934 - The metal beverage can is invented (American Can Co., United States) 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: 3/1/2026 12:54:19 PM
Last updated: 3/1/2026 1:13:06 PM
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