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TIL in the late '70s and early '80s, the Soviets "bugged" IBM Selectric II typewriters in the US Embassy in Moscow so they would report what the Americans were typing by radio. We only found out when a friendly country's embassy told us it had happened to their typewriters.

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XEXnR TIL consonants and vowels are defined by the sound they make when voiced, not the letters themselves. For example, the letter U is a vowel in ‘undergrad’ and a consonant in ‘university.’ The letter W is a consonant in ‘whisky’ and vowel(ish) in ‘saw.’
08oj TIL that as people become intimate with more partners, their mechanism to feel attachment becomes weaker
JYPlV TIL that within 10 minutes of Allies landing on Omaha beach D-Day 1944,every Officer of the first wave Alpha Company had been killed. 30 minutes later the entire first wave Alpha company had a 96% casualty rate
oBQjK TIL that Cracker Jack became the longest running product placement in American history thanks to the song “Take Me Out to the Ball Game”
9wwoM TIL that the world’s oldest wooden wheel has been around for more than 5,000 years