sentences:  Donald Crowdis
  
  Donald Crowdis (December 24, 1913 – November 27, 2011) was a Canadian educator, museum curator, broadcaster, and one of the world's oldest bloggers.He created "The Nature of Things" for CBC Television in 1960, which remains one of the longest running and most successful programs in Canada, and was a member of the executive team which oversaw the establishment of the Ontario Science Centre.