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TIL There is a group of people in Greece that developed a language of whistling to communicate long distances while sheep herding

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dDDJ9 TIL that Leo Marks, a WWII cryptographer, suspected that Germans had infiltrated the Dutch network in 1943 because all messages were being sent without any errors. To test his theory, Marks sent a message with "HH" and received "HH" in response. "HH" was a common German sign-off for "Heil Hitler."
6ERWw TIL the first generation of Mexican drug smugglers were Chinese-Mexican opium farmers from Sinaloa
Lead TIL certain dogs will nip at your heel due to its built in herding traits to bring your group together
bxX4 TIL there is a flying unit of the United States Air Force; The 53d Weather Reconnaissance Squadron (AFRC), also known by its nickname, Hurricane Hunters, that flies into tropical storms and hurricanes for the specific purpose of directly measuring weather data in and around those storms.
0wgwp TIL Tiger Woods is only 1/16th African-American and 75% Asian.