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TIL that SOS is a reverse acronym (a backronym). It is a distinctive and easy way to remember the morse code distress signal of three dots, three dashes, three dots. Only after its implementation did the mnemonic phrase such as "Save Our Souls come into use

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x6p4g TIL about the 'Loudness War' - beginning in the 1980s and peaking in the early 2000s, music producers and broadcasters increased the audio levels of albums and radio stations. As a result of consumer complaints, US legislators passed the CALM act which mandated maximum broadcast sound levels.
LgAP TIL the English language has a mark resembling an umlaut (called a diaeresis) used to show 2 vowels are also 2 syllables, as in coöperation. The mark is mostly defunct, but still used by The New Yorker magazine.
6E48J TIL that when the government of Kazakhstan threatened to sue Sacha Baron Cohen for the movie 'Borat', Baron Cohen (in character as Borat) replied: "I'd like to state that I have no connection with Mr. Cohen and fully support my government decision to sue this Jew".
8DRK TIL Americans look at mouths for emotional cues while Japanese look to the eyes, which explains why USA smileys look like :) and Japanese smileys look like (^_^)
Wkebd TIL that the halo sniper is real