Donald Bitzer, plasma screen co-inventor and the father of PLATO computer system, considered a precursor to messaging apps and more, died on December 10 at 90 (Harrison Smith/Washington Post)

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Harrison Smith / Washington Post:

Donald Bitzer, plasma screen co-inventor and the father of PLATO computer system, considered a precursor to messaging apps and more, died on December 10 at 90 — He helped shape cyberculture as the father of PLATO, a computer-based educational network that sparked the development of plasma screens and digital messaging.