In 1909 Marconi shared the Nobel Prize in Physics with the German physicist Karl F. Braun, the inventor of the cathode ray tube. Marconi’s accolades were not without controversy: many other men had claims (some dubious, some not) to the “Father of Radio” title. As early as 1895, the Russian physicist Alexander Popov was broadcasting between buildings, while in India Jagdish Chandra Bose was using radio waves to ring bells and trigger explosions. In 1901 the Serbian-American electrical pioneer Nikola Tesla said he had developed a wireless telegraph in 1893; in 1943 the U.S. Supreme Court invalidated four Marconi radio patents, citing Tesla’s prior work..