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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 June 24, 2021

A picture of a UFO in space.

It was on this date in 1947 that Kenneth Arnold, a private pilot, reported seeing the first post-war sighting of a UFO. And it was on this date in 1997 that the U.S. Air Force released a report dismissing UFO sighting claims in Roswell, New Mexico.