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TIL about "A True Story", the first sci-fi novel written by a Greek-speaking Syrian in the 2nd century AD. This satire is the earliest known work of fiction to include travel to outer space, alien lifeforms, and interplanetary warfare.

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9YO0D TIL of oncolytic viruses, viruses that are genetically modified to target and kill cancer cells
XELmR TIL the Appalachian Mountains were once part of a mountain range called the Central Pangean Mountains, which were created when the supercontinent Pangea was formed about 335 million years ago. Other mountains that were once part of that range are now in Africa and Scotland.
16ZKr TIL: Mexican Ranchero named Don Alejo (aged well in his 70s) killed 4 Los Zetas cartel members after they attempted to seize his ranch. He boarded up windows and used only his hunting rifles placed around his house. He died after they destroyed his house with grenade launchers.
4XGMX TIL Falcons are more closely related to parrots and songbirds than to other birds of prey
pYAaN TIL: According to a 2016 study, having a first-class section on an airplane quadruples the chances of an air rage incident. Furthermore, loading economy passengers through first class doubles the chances again.