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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 October 11, 2019

On this date in 1887 a new mechanism was patented for an elevator by an Ohio-born inventor. And in 1939, a letter written by Albert Einstein opened a lot of eyes -- including President Roosevelt.