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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 March 10, 2021

A photo of Lincoln's patent model.
Lincoln’s original patent model was acquired by the Smithsonian in 1908.

It was on this date in 1849 that Abraham Lincoln became the only future U.S. President to file a patent. It was for a device to lift a boat over obstructions. A copy of the scale model of this invention is now on display at the Smithsonian.