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TIL the armonica which Benjamin Franklin invented in 1761 (and some believed caused madness) owes its disorienting sound due to the way we perceive and locate sound. Above 4khz we use loudness for location. Below 1khz we use phase differences. The armonica (1-4khz) is in a range the brain is unsure.

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Yobx TIL of Dr Thomas Midgley. He is responsible for adding lead to fuel and for the creation of Chlorofluorocarbons (CFCs) used in refrigerators. He is credited for doing more damage to the atmosphere than any other living organism ever.
BggxL TIL There are over 350 recognized pasta types in Italy today, but in the 13th century, there were 4 main types: spaghetti, ravioli, macaroni and gnocchi.
0wZw5 TIL During World War II, the U.S. government urged Americans to save excess fat rendered from cooking and donate it to the army to produce explosives.
NXvbN TIL that the Pyramid Stage at Glastonbury Festival was first built in 1971 and modeled after the Great Pyramid of Giza. The current structure is the third incarnation, built in 2000.
AOag TIL that the company BlackRock has $3.67 trillion in assets under management. “If [it] were a country, then its assets […] would put it at the fourth largest in terms of gross domestic product, higher than Germany or France”.