{"id":623177,"date":"2026-01-18T21:50:45","date_gmt":"2026-01-18T20:50:45","guid":{"rendered":"https:\/\/cronologia-universale.it\/march-1938\/"},"modified":"2026-01-18T21:50:46","modified_gmt":"2026-01-18T20:50:46","slug":"january-27-1930","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/january-27-1930\/","title":{"rendered":"January 27, 1930"},"content":{"rendered":"<p>Albert Einstein and W.J. De Haas demonstrate the effect of ferromagnetism, through the alignment of the rotation of the electrons (later recognized as electronic spin) which causes, by gyroscopic effect, the rotation of the entire magnet to keep the total angular momentum unchanged.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Albert Einstein and W.J. De Haas demonstrate the effect of ferromagnetism, through the alignment of&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[41],"tags":[],"class_list":["post-623177","post","type-post","status-publish","format-standard","hentry","category-s-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>January 27, 1930 - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/january-27-1930\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"January 27, 1930 - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"Albert Einstein and W.J. 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