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TIL in 1921 a group of workers in a fertilizer factory stuck dynamite in a 4.5k lbs block of hardened ammonium nitrate to loosen it up. The resulting explosion killed 500 people, destroyed 80% of the surrounding homes and ripped the roofs off of buildings 15 miles away.

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JOpl TIL in 1914, Mexico arrested nine U.S. sailors in Verecuz for trespassing. The U.S. demanded the release of the sailors, an apology, and a 21 gun salute. Mexico released the sailors and issued an apology, did not give the 21 gun salute. The U.S. responded by invading and occupying the city.
YpbJZ TIL about “Anti-Japan Tribalism”—a book by professor Lee Young-Hoon— that argues the official history of the ROK is based on false narratives and that a number of South Korean scholars, journalists, activists, and politicians have been active in creating and spreading anti-Japanese sentiments & lies
VB7OZ TIL of the red flag act enacted in the late 19th century where every vehicle had to be led by a person on foot carrying a red flag to warn bystanders of the vehicle’s approach
BrEjD TIL that the highest absolute altitude ever achieved by a helicopter (12,440 m) resulted in the engines experiencing a flameout at peak altitude. The pilot then set the record for the longest autorotation used for the unpowered landing of a helicopter.
JYbMk TIL about cross dominance where each hand is better at different activities. Ex: being a lefty when writing but preferring the right hand for throwing a ball etc.