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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 23, 2021

A person taking a test.
TJ EVANS
/
PIXABAY

It was on this date in 1926 that the very first SAT test was given. And it was on this date in 1938 that the world's first aquarium opened its doors to the public in Florida. The aquarium was known as Marineland.