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TIL Leonhard Euler wrote some papers on music theory. However, these papers were considered “too mathematical for musicians and too musical for mathematicians.”

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Lnjv TIL In 1982, evolutionary biologist Daniel H. Janzen concluded that the avocado is an example of an ‘evolutionary anachronism’, a fruit adapted for ecological relationship with now-extinct large mammals.
a8Vly TIL that "Tunnel of Love" rides were popular at Amusement Parks in the early 20th century because they were one of the only socially acceptable opportunities for couples to be alone together on a date and share physical contact. In 1950, there were over 700 in the USA. Now there are less than 10.
wBoo TIL the Spanish have a tradition consisting of eating a grape with each bell strike at midnight of December 31
DQPyV TIL Guarani is the most widely spoken American language and remains commonly used among the Paraguayan people and neighboring communities.
p8obQ TIL that tetrachromes are people who can see millions more colors than normal people.