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TIL The Outer Space Treaty and COSPAR require that space exploration does not expose the earth to extraterrestrial contaminations. Additionally extraterrestrials cannot be exposed to contaminants from earth, so spacecrafts and lander have to be sterilized before going to other planets.

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R7M5a TIL there's an auditory illusion named the Shepard Tone, where multiple octaves are looped in such a way that it sounds like it's a sound rising in tone for infinity.
m1kyP TIL that countries around the world use planes, drones, and even ground-based operations in a technique called Cloud Seeding to add various salts to clouds to introduce hygroscopic particles, which increases rain particles, to increase rain production in dryer areas
GRp7 TIL Mormon founder Joseph Smith purchased Egyptian papyri from a traveling mummy exhibit. His translation of the text was entirely inaccurate but Mormons still regard this text to be true and as sacred as the Bible or Book of Mormon.
aX8y TIL Olympic shotguns cost between $3,000 and $100,000 or the difference, in the shooting world, between a Ford pickup and a Mercedes.
R58Bl TIL Female capuchin monkeys throw rocks at male capuchin monkeys to indicate sexual interest.