The television and television broadcasting were not discovered or invented by any single person. The three who had the most impact were Willoughby Smith, Paul Gottlieb Nipkow and John Logie Baird.Know More
Willoughby Smith discovered the photoconductivity in the element selenium in 1873. This led to Nipkow's invention of the scanning disk in 1884. He patented the first electromechanical television system that same year. Variations of Nipkow's spinning-disk, or image rasterizer, became exceedingly common and was used until 1939.
John Logie Baird gave the first public demonstration of televised silhouettes in motion on March 25, 1925. He held it at Selfridge's Department Store in London.Learn more about Inventions
Two Greek mathematicians pioneered research to navigate and map the Earth. Eratosthenes of Cyrene, chief librarian at the Ancient Library of Alexandria, calculated the circumference of the Earth in the third century B.C. In the second century B.C., Hipparchus of Nicea first used mathematics to calculate latitude and longitude, invented the first astrolabe to observe stars and measure latitude, and observed lunar eclipses to propose longitudes for specific cities.Full Answer >
Penicillin was discovered by bacteriologist Sir Alexander Fleming in 1928. The accidental discovery occurred when he observed several mold spores had fallen on and destroyed bacteria in an open laboratory dish.Full Answer >
No single person discovered algebra, since various people in different parts of the world discovered it at different times. Some aspects of algebra were even discovered multiple times by different people who were unaware of each other. Virtually every major civilization worked out some portion of the algebraic puzzle, although certain people like Diophantus, Muhammad Ibn Musa al-Khwarizmi and Gottfried Leibniz made more significant contributions.Full Answer >
The concept of matter arose with ancient Greek philosophers. Initially, Empedocles proposed that all things were made up of some combination of water, fire, earth and air.Full Answer >