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TIL During WWII, a single Australian division was purposely left behind, and ended up holding off the German army for 241 days. They protected the key port city of Tobruk, forcing the German supply lines to stretch over 900 miles to the next available port.

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5Yl48 TIL of Leon Ray Livingston—a famous hobo and author who traveled under the name “A-No. 1.” He perfected the hobo symbols system, which let other hobos know where safe places were, always dressed immaculately, and retired after the lifestyle “bought him to the brink of psychological collapse.”
dLYd TIL in 1990 disabled activists got out of their wheelchairs and crawled up the steps of the Capitol, inconveniencing Senators to encourage a vote on the Americans with Disabilities Act.
wL0jP TIL domestic dogs are one of only a few species that can understand that the human gesture of pointing means, "look in the direction my finger is pointing". Other animals, including wolves and other primates, don't understand how it works and will only be interested in your outstretched finger.
ky04 TIL Stetson Kennedy infiltrated the KKK in the 1940s, exposing its secrets to authorities and the outside world. He coined the term “Frown Power” when he started a campaign with that name, which simply encouraged people to pointedly frown when they heard bigoted speech.
4XJ8b TIL that in 1997, Cornell University created the world's smallest guitar at 10 micrometers. This is roughly the size of a single cell.