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TIL a large part of the Chinese wall was made of rammed earth. The famous stone wall named the Ming Wall was finished in the 15th/16th century.

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N7VlQ TIL Fresh snow absorbs sound, lowering ambient noise over a landscape because the trapped air between snowflakes attenuates vibration. That´s why it gets so quite when it snows.
JQ0v TIL: In 1979, Kane Kramer not only drew (quite accuratly) what would become the iPod, he accurately predicted digital music downloads before the internet as we know it existed.
lXba TIL Diane Fossey, a gorilla conservationist would track down poachers and torture them including setting one of their hut’s on fire and kidnapping their child for hostage. In her attempts to save the gorillas she made many enemies leading to her death, which is still unsolved.
ZPpY TIL that Alien (1979) was covered in ‘copious’ amounts of K-Y Jelly to give it a 'slimy’ effect. Also Predator’s (1987) blood composed of K-Y Jelly mixed with green glow stick fluid.
woZrE TIL that perpetual stew is a dish, which consists of different types of ingredients cooked in a pot. It can be cooked for decades by adding more ingredients and liquid frequently as well as heating it consistently.