{"id":615881,"date":"2026-01-18T17:39:29","date_gmt":"2026-01-18T16:39:29","guid":{"rendered":"https:\/\/cronologia-universale.it\/3000-bc-4\/"},"modified":"2026-01-18T17:39:29","modified_gmt":"2026-01-18T16:39:29","slug":"4000-bc-9","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/4000-bc-9\/","title":{"rendered":"4000 BC"},"content":{"rendered":"<p>Humans learn to extract and work copper. This element possesses some unique properties that have been exploited by man in the past: first and foremost, its color; it is the only red metal, comparable to gold, the only other colored metal. Furthermore, its malleability, making it easy to work with, its abundance, its strong conductivity of heat and electricity, and, finally, its ductility.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Humans learn to extract and work copper. This element possesses some unique properties that have&#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-615881","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>4000 BC - 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\/4000-bc-9\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"4000 BC - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"Humans learn to extract and work copper. 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