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TIL that the first British ocean-going iron warship deployed and operated in China during the first Opium War

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D1vOV TIL that a wildly popular Canadian TV show (The Red Green Show) made a change to a key segment for its remaining 10 seasons after receiving a single request for it from a blind viewer.
woKmE TIL The Lockheed SR-71 Blackbird used an Astro-inertial Navigation System to track Stars and determine its position and altitude. At Mach 3, the navigation system was accurate enough to limit drift to 1,000 feet (300 meters) off course.
0wPx5 TIL 'Hello' as a greeting is credited to Thomas Edison. Hello likely derived from hullo, a expression of surprise, but was seen by Edison as good greeting for telephone conversations. Alexander Graham Bell initially used Ahoy (as used on ships) as a telephone greeting, but it didn't take off.
Lky1v TIL Hitler's personal nurse revealed in 2005 that the death of Blondi the German Shepherd affected people in the bunker more than Eva Braun's suicide
ne1AG TIL This photo of U.S. Army code breakers trained by William Friedman and his wife Elizebeth during WW1 spells out ‘Knowledge is Power.’ By facing either forward or sideways, the soldiers formed a coded phrase utilizing Sir Francis Bacon’s biliteral cipher.