It was on this date in 1921, the first ever NFL game was played between the Green Bay Packers and Minneapolis Marines. And it was on this date in 1964 that Time magazine coined the phrase "Op-art."
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 October 23, 2020.
![Photo of the inaugural team of the Green Bay Packers, 1919.](https://npr.brightspotcdn.com/dims4/default/8389894/2147483647/strip/true/crop/680x383+0+0/resize/880x496!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2F89%2Ff8%2F4ae7a0a243fdaabfa934d554f50f%2Fefhx-b6umauopyw.jpg)
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