Short answers, pulled from the story.
The phrase disc jockey first appeared in print within the pages of Variety magazine during 1941. Radio gossip columnist Walter Winchell coined the term back in 1935 to describe the radio work performed by Martin Block.
Matsushita released the SP-10 as the first direct-drive turntable available on the market in 1969. This machine eliminated belts and employed a motor to directly drive the platter where vinyl rested.
Hip-hop DJ Kool Herc developed a style that became the blueprint for an entire genre during the early 1970s. He played records such as James Browns Give It Up or Turnit a Loose at block parties in the South Bronx from 1973 onwards.
Germany developed a distinct global influence known as the Munich Sound during the disco era. Producers based in Munich including Giorgio Moroder pioneered a synthesizer-heavy hypnotic sound.
Sweden's first female disc jockey was Jill Wernström who appeared in 1971. Mark Katz wrote in 2007 that very few women do turntablism battles though the matter has been discussed for years.
Nightclubs constantly exceed safe levels of noise exposure with average sound levels ranging from 93.2 to 109.7 decibels. Three-quarters of DJs have tinnitus and face risks of tenosynovitis in their wrists and other limbs.