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TIL that Dave Grohl played drums on all of Tenacious D’s studio albums

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Z8ara Berezniki, in Russia's Ural mountains, is slowly disappearing into the ground. The industrial city, with a population of over 150,000, was built on top of a salt mine. Since the 1980s, huge craters have ripped the soil apart, gradually swallowing factories and offices, demolishing a school and tearing houses apart.
WDgd TIL the warning tones played before an Emergency Alert Broadcast contain information and automatically activate the system by audio alone. Playback of the recorded tones (like in an an ad) over TV or radio can kick the actual system online, resulting in heavy fines.
9x76 TIL that when asked what would happen if he were invited to a dinner party with his characters, Dr. Seuss said, “I wouldn’t show up.”
M7Ej8 TIL about Black Sunday, April 14, 1935, when a massive dust storm hundreds of miles wide and thousands of feet high tore through Oklahoma and Texas. Temperatures dropped 30+ degrees in 2 hours as the storm turned day into night, plunging the Southern Plains into total darkness.
W7VnX TIL that the Czech Republic is home to the largest castle complex in the world, Prague Castle. The complex covers over 70,000 square meters and includes numerous palaces, churches, and gardens. It has been the seat of Czech rulers for over a thousand years.