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TIL that there are three countries in the world completely surrounded on all sides by another country. These are Lesotho, San Marino, and Vatican City. The latter two are both completely contained within the same country, Italy.

69B6l TIL that the word with most meanings in the English language is the word "set." It has 430 senses listed in the Second Edition of the Oxford English Dictionary, published in 1989. The word commands the longest entry in the dictionary at 60,000 words, or 326,000 characters.
nej0d TIL in 1832 after the death of philosopher Jeremy Bentham his body was preserved and displayed in the University College London, however his preserved head was henceforth placed in secure storage after it was stolen by several students and found in a luggage locker at a Scottish railway station.
MemRK TIL that Adolf Hitler did not invent concentration camps. They have likely been in use for centuries, as a method to supress/eliminate unwanted elements of society. Documented examples prior to the 1800s are however not easily found.
x6Jpw TIL about the "Cathedral Effect" phenomenon, where higher ceilings seem to bias the brain toward more abstract and creative thinking, while lower ceilings promote more detailed, analytical thinking.
e0JNb TIL the Levi Straus was not the inventor of Denim jeans but partnered with Jacob Davis after Davis approached him to fund the patent. Jacob Davis devised the riveting of the pants independent of Straus and also came up with the double orange threaded stitch design.