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TIL The Assyrians had basic lens technology. One of their creations, the Nimrud lens, dates to 710 BCE, though its purpose is debated. Lenses could have been used to start fires, as decoration, or astronomy tools (with references to the snakes of saturn being the rings or mythology)

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OG8eY TIL that Craig Ferguson, the host of The Late Late Show would rip up his blue note cards (which contained potential questions for guests) as a way of signifying that what was coming wasn't really planned. Sometimes, that brought a lot of empty riffing with a celebrity who just couldn't keep up.
NYdE TIL July 2nd is the exact middle of a non leap year, 182 days both before and after today.
ne76P TIL that playing Dungeons & Dragons with 4 or more people in prison constitutes a ‘Security Threat Group’ or gang. The gang hierarchy being formed by the players and the dungeon master.
j6XXa TIL about the Morning Glory cloud, a rare meteorological phenomenon. It is a cloud that can be up to 1000 km (620 mi) long and 1-2 km (0.62-1.24 mi) high. The Gulf of Carpentaria in Australia is the only known location where it can be predicted and observed regularly
DQXxP TIL that before the rise of the Nazis in Germany, the Swastika was a common symbol associated with good health and wellbeing, appearing on RAF planes, fruit packaging and even Coca-Cola merchandise.