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TIL researchers in Scotland conducted a study on the effects of music on dogs’ behavior. They played a variety of music to dogs and assessed physiological and behavioral changes. The dogs responded most positively when they were played reggae and soft rock over other genres of music.

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loNga TIL that "Tattoo" is a military bugle call played daily in the U.S. Army, not long before "Taps", which is played last; the word has a completely different etymology than does "tattoo" meaning a design inked into the skin.
jeKE TIL the first level of Super Mario Bros (NES) was precisely designed so as to teach a new player that getting mushrooms was good, blocks could be hit, and jumping on gumbas wouldn’t hurt you, by making these actions almost impossible to avoid.
woE81 TIL some moth caterpillars make sounds to avoid being eaten or tasted. They are among animals that advertise or signal to potential predators they are not worth attacking through colours, sounds, odours, or other characteristics that warn about being unpalatable or poisonous
4kp5b TIL of the California Genocide, the killing of thousands of indigenous peoples of CA by US government agents and private citizens in the 19th century. Between 1846 & 1873, it is estimated that non-Natives killed between 9,462 and 16,094 California Natives. Most of the deaths were village massacres.
d8dlQ TIL Emilio Salgari, Italy's greatest adventure writer and the "Father of Spaghetti Western", never traveled outside Italy, all he knew about foreign cultures he learned from books and travel manuals.