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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 September 27, 2019

On this date in 1954, a new late-night program debuted on NBC that has gone on to become the longest running regularly scheduled entertainment program in the United States. And in 1996, one of the worst oil spills occurred in Portland, Maine.