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Dropping a Dynabook: A comic that turned from Science Fiction to Science Fact

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Some time around 1982, I saw an amazing comic on the wall of a Xerox Alto computer room at the MIT AI Lab . Given the subject matter, I assume the comic was originally created at Xerox PARC , possibly as part of the NoteTaker project, but can't find any trace of it on the web. I have recreated it from memory, below. The comic is explaining the events that happen when a Dynabook is accidentally dropped off the top of Half Dome in Yosemite National Park . Note that a free-fall calculator  claims that it would take over 12 seconds for the Dynabook to hit the Yosemite Valley floor. T+00.000 Dynabook accidentally dropped from top of Half Dome. T+00.016 Dynabook notices that It can't sense its user. It is in zero gravity. There is a 200 MPH wind from below. Dynabook concludes that it is falling. Turns off the display to save memory.  Opens a radio connection to El Capitan radio tower. Begins backing up the user's recent changes. T+05.000 Dynabook hits