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Mark Pennell sits at the helm of his time machine.Mark's Almanac is a 90-second time travel that highlights the world's history from the very serious to the sometimes sublime.

Mark's Almanac for November 29, 2021

A Pong cabinet is on display at the Neville Public Museum in Green Bay, Wisconsin.
CHRIS RAND
/
WIKIPEDIA
A Pong cabinet is on display at the Neville Public Museum in Green Bay, Wisconsin.

It was on this date in 1775 that James Jay invented invisible ink. And it was on this date 1972 that Atari released the videogame, Pong.