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The Lower Paleolithic period lasted over 3 million years, during which there many human-like species evolved including toward the end of this period, Homo sapiens.The original divergence between humans and chimpanzees occurred 13 (), however interbreeding continued until as recently as 4 Ma, with the first species clearly belonging to the human (and not chimpanzee) lineage being ...
20th Century Fox presents in New York on an 8 m × 4 m big screen the first widescreen movie. The radio station Witzleben begins in Germany with the regular broadcasting of television test broadcasts, initially on long wave with 30 lines (= 1,200 pixels) at 12.5 image changes per second. It appear first blueprints for television receiver.
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The 20th century saw mathematics become a major profession. As in most areas of study, the explosion of knowledge in the scientific age has led to specialization: by the end of the century there were hundreds of specialized areas in mathematics and the Mathematics Subject Classification was dozens of pages long. [72]
Pages in category "20th-century American inventors" The following 200 pages are in this category, out of approximately 1,332 total. This list may not reflect recent changes .
September 30: 30 September Movement in the Indonesia. November 24 – 25: Congo Crisis ends; Joseph Mobutu becomes dictator of the Congo. December 8: Second Vatican Council is closed by Pope Paul VI. December 30: Ferdinand Marcos becomes President of the Philippines. Beginning of the anti-Communist purge in Indonesia, which killed up to 500,000 ...