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TIL that female dogs are more responsible for dead grass spots than males due to congealed nitrogen from squatting to pee opposed to lifting a leg and spreading it out.

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W7LwB TIL Taking an old song and just changing the words to make a new song is called contrafactum. Earliest examples of contrafactum date to the 9th century and a famous examples is "For He's a Jolly Good Fellow", 1800s adapted from "Marlborough Has Left for the War", 1700s.
4pQ5 TIL the UK has a bigger population than the combination of Australia, Canada and New Zealand, despite being less than 2% of their total size (by area)
d85er TIL: The inspiration for Gandalf's saying in The Lord of the Rings, "You shall not pass!" could come from a French saying in WWI "Ils ne passeront pas!". JRR Tolkien was a WWI veteran and had participated in the Battle of the Somme.
emnn TIL The Concorde supersonic jet stretched during flight due to the heat it generated. On its final flight the crew placed their hats into a crevice in the floor which appeared during the flight, as the aircraft cooled the crevice closed, permanently sealing their hats in the aluminum airframe.
4kL0a TIL that Crossword puzzles are always rotationally symmetric, have a theme, and the authors are called Cruciverbalists!