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.
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.](https://npr.brightspotcdn.com/dims4/default/80d0c6d/2147483647/strip/true/crop/336x250+0+0/resize/880x655!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2F8f%2Fe5%2F31c336a54a3f8955f4c9b622a6e8%2Fh10protest.gif)
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