This infographic provides an in-depth account of the amazing progression of presentation technology over the past two centuries.
From the blackboard in the early 19th century, to the Kodachrome 35mm slide film of the 30s, to the overhead transparency projects used in the 40s by the police and Army, to the release of PowerPoint in 1987 only for Macintosh (astonishing), to the myriad of cloud-based and mobile options available today today.
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