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TIL Saturn's rings have an atmosphere of molecular oxygen (O2) which is independent from the planet's atmosphere.

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R5lW1 TIL a link between testosterone and baldness was first discovered in a 1940s era study of mental hospital patients who were castrated and later injected with testosterone. These observations are now credited with helping to produce some of our modern treatments for male pattern baldness.
XNNR TIL William Shatner recorded a wake up call that was played for Space Shuttle Discovery and its crew for their last day docked at the ISS. Saying “Space, the final frontier. These have been the voyages of the Space Shuttle Discovery. Her 30-year mission:…”
kOaVd TIL of Timothy Hunter, a DC Comics character created by Neil Gaiman seven years before Harry Potter and the Sorcerer's Stone. He wears glasses, lost his mother when he was young, discovered he was destined to be a powerful wizard, and has a pet owl.
GYxQ1 TIL that it's very problematic to make an accurate and/or precise measurement of something as seemingly mundane as coastlines, due to the Coastline Paradox. Although the actual measurement cannot be theoretically infinite, coastlines are practically immeasurable in terms of standardized consistency.
M7Dym TIL there was no use of green screen or visual effects in the music video for A Thousand Miles by Vanessa Carlton