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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 27, 2020

Simon Steinberger
Though he was most famous for his contributions to cinematography, Fred Waller patented water skis on this date in 1925.

It was on this date in 312, Emperor Constantine saw a vision of a "a cross-shaped trophy formed from light" before the Battle of Milvian Bridge. And on this date in 1925, film pioneer and inventor Fred Waller patented water skis.