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TIL Some lungfish need air to respire and their gills don't provide enough oxygen

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VBwvD TIL about Leonhard Euler (1707-1783) who not only popularised the use of lower case Pi to denote the ratio of a circle's circumference to it's diameter, but was also the first to use "i" to denote the square root of -1. The constant "e", the base number in a natural logarithm is the Euler Number
pYGKb TIL one of the first use of avant-garde technique of tape manipulation in music was the 1955 hit "Jingle Bells" by The Singing Dogs. Using a razor, Carl Weismann cut, then spliced sounds of dog barks together, correcting speed, pitch and melody of the resulting tape. It reached #22 on Billboard.
6768 TIL Reminder - Main song from “O’ Brother Where Art Thou’ was an archival recording of an actual prisoner 40 years earlier. The record label tracked him down, paid him, and took him to the Grammys.
DQNej TIL contrary to popular belief Romans didn't forfeit Germania after the battle of Teutoburg forest, they sent 8 legions to recover their eagles and punish the Germans, after committing a minor genocide the legions were re-called over political concerns about the growing popularity of their general.
69En8 TIL - The City of London is a district of approx. 1sq mile that is distinct from "Greater London" and has a population of approx. 9500 people however, over 500k people are employed there.