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From today's featured article

A painting of the ship bombarding Belgrade in 1914

SMS Körös was the first of the Körös-class river monitors built for the Austro-Hungarian Navy and completed in 1892. As part of the Danube Flotilla during World War I, the ship fought various Allied forces from Belgrade down the Danube to the Black Sea. Renamed Morava after the war, she was transferred to the newly created Kingdom of Serbs, Croats and Slovenes (later Yugoslavia), and remained in service throughout the interwar period, although not always in full commission. During the German-led Axis invasion of Yugoslavia in April 1941, Morava was the flagship of the 2nd Mine Barrage Division, operating on the Tisza river. The river monitor fought off attacks by the Luftwaffe and shot down one enemy aircraft, but was forced to withdraw to Belgrade. High river levels and low bridges made navigation difficult, and the ship was scuttled by the crew on 11 April. She was later raised by the navy of the Axis puppet state of Croatia and continued to serve as Bosna until striking a mine and sinking in June 1944. (Full article...)

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Rock-Olga in 1959
Rock-Olga

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On this day...

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William the Conqueror
William the Conqueror

Today's featured picture

The Biham–Middleton–Levine traffic model for a 144 x 89 lattice, with a traffic density of 39%. The model has self-organized to a disordered intermediate phase. The red cars and blue cars take turns to move; the red ones only move rightwards, and the blue ones move downwards. Every time, all the cars of the same colour try to move one step if there is no car in front of it. This video has been sped up such that only one in four frames is shown.

See the periodic intermediate phase

Film: Dllu

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