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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 24, 2021

 Members of the Hollywood Ten and their families protesting the impending incarceration.
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Members of the Hollywood Ten and their families protesting the impending incarceration.

It was on this date in 1874 that Joseph Glidden received a patent for barbed wire. And it was on this date in 1947 that the Hollywood Ten were held in contempt by the House Un-American Activities Committee for their refusal to reveal whether they were communists.