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TIL That Sonar used by Naval ships is a billion times louder than a jet engine at 230db. Its also audible (in the water) for hundreds of miles, and is lethal when swimming underwater, even hundreds of feet away from the source.

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YDld TIL Hong Kong is lead by a CEO rather than a state official. It is literally run as a business, with China recognising it more as an economic entity than a city.
EZkP TIL there’s a Forbes ranking for the 15 richest FICTIONAL characters - and at #1, it’s Smaug the dragon.
nDaW TIL Mattel once tried to sue Aqua over their song “Barbie Girl”. The judge literally told them to “chill”.
vPpeB TIL about The Lady Killer, which was the biggest box office bomb ever in Indian Cinema. It had a budget of 45 crore rupees (53M USD) and grossed only 70000 rupees (8.3k USD
D1MPg TIL that infrasound, a sound wave with frequencies below 20 Hz making it unable to be heard by people, can cause recipients to feel fear, anxiety, sorrow, depression, and nausea; it has also caused recipients to see hallucinations which causes them to think of it as a paranormal/supernatural event.