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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 December 31, 2021

 A photograph of Thomas Edison holding an incandescent lightbulb.
THE NATIONAL ARCHIVES
/
WIKIPEDIA
A photograph of Thomas Edison holding an incandescent lightbulb.

It was on this date in 1879 that the first public demonstration of Thomas Edison's incandescent lightbulb took place in Menlo Park, NJ.