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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 December 6, 2021

 A photograph of U.S. President Calvin Coolidge.
LIBRARY OF CONGRESS
A photograph of U.S. President Calvin Coolidge.

It was on this date in 1923 that U.S. President Calvin Coolidge became the first to deliver a presidential address on radio. And it was on this date in 1947 that the Everglades Nation Park in Florida was dedicated.