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TIL the USA spent 2 years building a fort to protect from Canadian invasion, but it was accidentally built in Canada. They abandoned construction and called it Fort Blunder.

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gMLm7 TIL about the "Mad Hatterpillar" Uraba lugens, the gum-leaf skeletoniser, Nicknamed the mad hatterpillar because of its distinctive exoskeletal feature. Every time it sheds the head portion of its exoskeleton, stays attached creating a stack of increasingly large heads!
17JP TIL that a man was injected with Plutonium without his knowledge or consent and survived for 20 years, eventually surviving the highest radiation dose known for any human
QZ4E TIL that in 2001 Argentina had 5 presidents in 2 weeks.
ne4L9 TIL the sample used as the iconic intro and riff of Dr. Dre’s “The Next Episode” was recorded by the guy who plays Dr. “Ducky” Mallard on NCIS.
KY9M9 TIL that there's a reason why smoke alarm tend to need battery replacement at night. As the temperature drops at night, the battery’s chemical reaction slows and the voltage lowers. The internal circuit then detects this as battery needing replacement.