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TIL My belief that the reason there is no channel 1 on TV sets was because channel 1 was reserved for the US military is WRONG! Experimental TV stations on channel 1 frequencies experienced too much radio interference. So the FCC cut channel 1 leaving channels 2 thru 12 on VHF.

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JD5k TIL At a depth of almost a mile, Lake Baikal in Russia is the deepest lake in the world. It is also the clearest and oldest lake while containing 20% of the worlds fresh water.
J1YN8 TIL Mankind constantly analyzes radio waves from outer space in the search for extraterrestrial intelligence. Since this analysis started, almost all of the signal sources have been identified. 37 signals, however, remain unexplained. Hence the name of the Co that created Basecamp.
BgVMK TIL a study in the 1920s found that one out of 17 invertebrates caught in midair is a spider. They can get all the way up into jet streams and survive there for a few weeks.
6wZZ TIL The Abe Lincoln is the only US President to register a patent - a device used to help boats over obstructions.
d8Z5E TIL that modern computing can be traced back to fabric making on looms in the early 1800's. Punchcards were used to programmatically weave patterns. Named after their founder, Jacquard Loom cards helped inspire Charles Babbage's Analytical Engine and early IBM computing.