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TIL the warning tones played before an Emergency Alert Broadcast contain information and automatically activate the system by audio alone. Playback of the recorded tones (like in an an ad) over TV or radio can kick the actual system online, resulting in heavy fines.

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LQMN0 TIL in the early 1860s the New York based William H. Webb Shipyard in New York built two ironclad warships for the Italian navy.
PZrL TIL there is a creek in Wyoming that splits and flows to both the Atlantic and Pacific oceans. It is thought that cutthroat trout used this passage to cross the Continental Divide.
k5kB TIL 1992 an officer in the Soviet KGB defected to the west brining with him thousands of notes he took during his career in the KGB archives. These notes reveal the KGB’s hand in framing the US government for the Kennedy assassination, spreading the rumor that AIDs was a US invention, and much more.
9YJg7 TIL the 1926 Ohio/Indiana border town of College Corner had a high school football team that went 30-2, the team was made up of Miami University football players
YlrA TIL that Billy Joel never sells front row seats in order to see the real fans right in front of him. He gives them away to random people in the cheap seats so that front row isn’t always just wealthy people.