The Halifax Disaster occurred on this day in 1917. There's more on the tragedy in the December 19, 2011 episode of Stuff You Missed in History Class.
This Day in History Class
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Lonnie Johnson patents the Super Soaker - May 27th, 1986
Flashback episode - May 24th
Sergeant William Carney is awarded the Medal of Honor - May 23rd, 1900