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Nikola Tesla ( / ˈtɛslə /; [2] Serbian Cyrillic: Никола Тесла, [nǐkola têsla]; 10 July [ O.S. 28 June] 1856 – 7 January 1943) was a Serbian-American [3] [4] inventor, electrical engineer, mechanical engineer, and futurist. He is known for his contributions to the design of the modern alternating current (AC) electricity supply ...
VK (short for its original name VKontakte; Russian: ВКонтакте, meaning InContact) is a Russian online social media and social networking service based in Saint Petersburg.
Oklahoma is the 20th-largest state in the United States, covering an area of 69,895 square miles (181,030 km 2 ), with 68,591 square miles (177,650 km 2) of land and 1,304 square miles (3,380 km 2) of water. [64] It lies partly in the Great Plains near the geographical center of the 48 contiguous states.