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TIL when Mt. St. Helens erupted, the blast was heard in British Columbia, Montana, Idaho, and California. However, the blast was not heard in Portland, Oregon only 50 miles away.

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via reddit.com

rbQ1 TIL that the largest cavalry charge in history occurred during the Turkish siege of Vienna. Spearheaded by 3000 winged knights, 20,000 Polish and German cavalrymen charged and routed the Ottoman line and decisively ended the Ottoman threat to christian Europe.
xmwB TIL The tough ultramarathon Barkley 100 mile race, with just 15 finishers in 29 years, starts off with the founder lighting a cigarette.
P1ejJ TIL in 1794, the French government decided to remove the lead roof tiles of Basilica of St. Denis and melt them down to make bullets.
R7lVQ TIL in 1624 Marco Antonio de Dominis was publicly burned at the stake by the Catholic Church for his many “heresies” in both science and philosophy. Among them — being first to use science to accurately describe how rainbows are formed.
KOLQQ TIL the 2002 Canadian cartoon 'RoboRoach' (which followed the story of a cyborg cockroach) was inspired by the true story of cyborg cockroaches created by scientists at the University of Tokyo