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Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman who has been described as America's greatest inventor. He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. These inventions, which include the phonograph, the motion picture camera, and early versions of the electric light bulb, have had a widespread impact on the modern industrialized world. He was one of the first inventors to apply the principles of organized science and teamwork to the process of invention, working with many researchers and employees. He established the first industrial research laboratory.Edison was raised in the American Midwest; early in his career he worked as a telegraph operator, which inspired some of his earliest inventions.
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Patna (listen) is the capital and largest city of the state of Bihar in India. The city of Patna had an estimated city population of 1.68 million in 2011, making it the 19th largest city in India. With an area of 250 square kilometres (97 sq mi) and population over 2 million people, the Patna urban agglomeration is the 18th largest in India. Patna serves as the seat of Patna High Court.
One of the oldest continuously inhabited places in the world, Patna was founded in 490 BCE by the king of Magadha. Ancient Patna, known as Patliputra, was the capital of the Magadh Empire under the Haryanka, Nanda, Mauryan, Shunga, Gupta and Pala empires. Pataliputra was a seat of learning and fine arts. It was home to many astronomers and scholars including Aryabhata, Vātsyāyana and Chanakya. During the Maurya period (around 300 BCE) its population was about 400,000. Patna served as the seat of power, political and cultural centre of the Indian subcontinent during the Maurya and Gupta empires. With the fall of the Gupta Empire, Patna lost its glory. It was revived again in the 17th century by the British as a centre of international trade.
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