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TIL about the Kent State Massacre, where the National Guard opened fire on unarmed students at Kent State University. Students were staging a peace rally (though not all of those killed were involved in the rally). Soldiers fired 67 rounds in 13 seconds.

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KYoEG TIL every fraction of sevenths is the same sequence of recurring numbers but with the decimal point moved. 1/7=0.142857, 2/7=0.285714, 3/7=0.428571 etc.
yQZZa TIL A software developer rigged the lottery software he coded in several states, so he would know what the winning numbers would be 3 days per year.
KOkjG TIL that Jeff Bezos makes the average U.S. annual salary ($47,060) in 9.4 seconds.
7ygP TIL humans are the only mammal species that have completely lost their penis bone
nWX0W TIL: About the undersea volcano, Marsili - one of the Mediterranean's most dangerous volcanos. As of 2010, warnings say it could erupt at any time sending up to a 30m (100 ft) tsunami reaching Italy's Sicilian and Calabrian coasts in 10-20 minutes.