{"id":622372,"date":"2026-01-18T21:23:43","date_gmt":"2026-01-18T20:23:43","guid":{"rendered":"https:\/\/cronologia-universale.it\/november-9-1917\/"},"modified":"2026-01-18T21:23:43","modified_gmt":"2026-01-18T20:23:43","slug":"1909","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/1909\/","title":{"rendered":"1909"},"content":{"rendered":"<p>German scientist Theodor Wulf measured ionizing radiation at the base and top of the Eiffel Tower and discovered that at the top, it was only slightly less than half that on the ground. That is, much more than he would expect if it were emitted by terrestrial rocks, as was the current theory at the time. Wulf had just discovered cosmic rays.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>German scientist Theodor Wulf measured ionizing radiation at the base and top of the Eiffel&#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":[43],"tags":[],"class_list":["post-622372","post","type-post","status-publish","format-standard","hentry","category-vg-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>1909 - 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\/1909\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1909 - 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