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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 11, 2020

A photo of Guglielmo Marconi seated with a telephone in hand.
A photo of Guglielmo Marconi, the inventor of radio.

It was on this date in 1896 that Guglielmo Marconi demonstrated radio for the first time in a public lecture. And it was on this date in 1941 that Italy and Germany declared war on the U.S.