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TIL backyard ultra, a type of ultramarathon where competitors must run 6.706 km within one hour, repeatedly. The last runner to complete a lap is declared the winner and the only finisher, with all others receiving a "DNF". The longest distance record is 110 laps, covering 737 km over five day.

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xkPo TIL warning signs for our nuclear wastes today need symbols which can be understood by the future generations without the assumption that knowledge can be passed to them, and taking into consideration the possibility of human civilization crumbling away.
LQxPd TIL The infamous Stanford Prison Experiment done by Philip Zambardo was entirely flawed. Zimbardo copied one of his students studies done 3 months prior, and used coercion, fear, and manipulation to get the results he wanted. This has led to many negative beliefs about human nature.
R7ODw TIL In 1574, the Dutch city of Leiden was under siege by Spanish forces. The defenders breached dykes, flooding the low lying countryside. Naval ships reached the city on Oct 3rd, bringing bread and herring and ending the siege. Leiden still gives citizens free bread and herring every Oct 3rd.
wo0LM TIL that Magellan's expedition, which began with approximately 270 crew members aboard five ships, concluded nearly three years later with only 18 survivors returning on a single vessel.
bwbj TIL in WWI, over 600 German soldiers burned to death at Fort Douaumont because someone tried to heat up coffee with flamethrower-fuel, resulting in a fire that spread to the ammunition