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TIL the Great Stalacpipe Organ used Virginia’s Luray Caverns to produce music by striking the cave’s stalactites with solenoid-actuated rubber mallets to produce sound. The organ can be heard anywhere within its 64-acre (260,000 m^2) confines

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rgEo TIL that over 2000 large man-made tunnels, known as “Erdstall”, have been discovered across Europe, and nobody knows who made them or why
Kko6 TIL that Conan’s ex-drummer and Slipknot’s current drummer are father and son (Max & Jay Weinberg).
oBJb7 TIL of the "Dinosaur Mummy" - Borealopelta remains discovered with the protective armor, skin, and partial stomach intact. It's been so well preserved that scientists deemed it closer to a mummy than a fossil.
0Mvv TIL a man jumped 500 feet from a tour helicopter to commit suicide because “he was unable to get surgery for a chronic health condition he suffered with for the past 15 years” at age 61
5Y49B TIL Phantosmia is a condition that causes you to smell odors that aren't actually present. When this happens, it's sometimes called an olfactory hallucination.