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TIL Some Green Victorian Books Were Colored with Arsenic and are Considered Poisonous

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R7MK4 TIL Ancient China knew about the Roman Empire. They called them "Daqin" (大青) and documented several things concerning them, including a guide on how to reach them from China.
8eMWa TIL The US attempted to engineer longer monsoon seasons in Southeast Asia during the Vietnam War in order to 'ruin roads, jam rivers, and extend the amount of time swathes of Vietnam weren’t traversable.' After 5 years and millions of dollars spent, it's not clear if it accomplished anything.
a8Y7b TIL the oldest known zoo dates to c. 3500 BC in ancient Egypt.
QjVa TIL there was such a thing as Woolly Rhinos
Rm14 TIL the pilot and co-pilot of a flight never eat the same meals to lower the risk of food poisoning and endangering the flight.