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TIL about Ernst Thälmann Island. In the 1970s, Cuba renamed one of its islands after German communist Ernst Thälmann and promised it to East Germany. After reunification it wasn't mentioned in treaties, leading some to claim it's still East German territory, but Cuba rejects this

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W9Z4 TIL cats are banned from the world’s northernmost city of Longyearbyen because they pose a threat to the local bird population.
KYZ8Q TIL that Sirius B, the smaller star of the Sirius binary system, has a little more mass than the Sun while being slightly smaller than the Earth.
XE9pj TIL Johann Trollmann who was a gypsy boxing champion put in a labour camp in Nazi Germany, was forced to fight against a feared ex-criminal and prison guard and won despite being malnourished and exhausted. The still bitter prison guard sought revenge by murdering Johann with a shovel later.
dDavd TIL that Adidas is actually named after it's owner Adolf Dassler, who created sport shoes along with his brother. Both Adolf and his brother joined the Nazi party in 1933.
KODdJ TIL modern nuclear submarines are so well cloaked that in 2009, two French and British nuclear ballistic missle subs collided in the atlantic ocean by pure chance. Moving very slowly, they were't able to detect each other just feet apart.