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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."

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N1YE TIL in 1996 Fox tried to place a computerized blue halo around the pucks in hockey games to make them more visible. That technology later evolved into the yellow first down line in football.
mx55R TIL that Lake Okeechobee, despite being Florida's largest freshwater lake and covering an area of 730 square miles, has an average depth of just 9 feet.
JYykB TIL the U.S. Constitution forbids members of Congress from holding ‘any office under the United States’ concurrent with their congressional service. Legal scholars have concluded that individuals holding military commissions should be barred from serving in Congress.
8waX TIL Canada has a little-known, “world class,” elite special ops force called Joint Task Force 2, which was the only foreign unit accepted to join top-tier U.S. special operations units in Afghanistan
dd0Z TIL in his later years, Sir Isaac Newton was appointed to a largely symbolic (but paid) position at the Royal Mint. He took the job seriously and successfully prosecuted many counterfeiters for high treason. Those convicted were hanged, drawn and quartered