Individual #Roger_Bacon__Bacon  English Franciscan monk and scientist who stressed the importance of experimentation; first showed that air is required for combustion and first used lenses to correct vision (1220-1292)
  type:  #monk__monastic  a male religious living in a cloister and devoting himself to contemplation and prayer and work
  type:  #scientist__man_of_science  a person with advanced knowledge of one of more sciences

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