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TIL in 2009 a Maryland wastewater treatment plant was found to be inhabited by over 100,000,000 orb-weaving spiders, the largest recorded aggregation in history. The entire facility was covered in dense sheets and volumes of webbing, leading to it being nicknamed it the "Back River Arachnotopia".

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lopB1 TIL The moon's tidal forces are slowing down Earth's rotation over time. 500 million years ago, days on Earth were 21-22 hours long
QNQoL TIL The firm who repaired seat covers on San Francisco's BART trains started paying people to slash the fabric, eventually accounting for 85% of vandalism reports
6EKPX TIL that the British Standards Institute produced a 5000+ word report on how to make a perfect cup of tea, including implements and equipment, ideal temperature and when to add milk.
awElb TIL Jeff East, who portrays a young Clark Kent in the 1978 film 'Superman', wore a prosthetic nose to better emulate Chris Reeve.
ZekY TIL in 1942 RMS Laconia was sunk by a German U-Boat who then commenced rescue operations, broadcasting their humanitarian intent on open radio. With a deck full of survivors, USAAF bombers then sunk the boat. The German navy subsequently abandoned attempting rescue of civilian survivors.