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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 April 22, 2021

The unofficial Earth Day Flag created by John McConnell.
JOHN MCCONNELL
/
NASA
The unofficial Earth Day Flag created by John McConnell. It includes The Blue Marble photograph taken by the crew of Apollo 17.

It was on this date in 1692 that Edward Bishop was arrested for suggested flogging as a cure for witchcraft during the infamous Salem witch trials. And it was on this date in 1970 that the first Earth Day was celebrated.