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EgJbd TIL primates are the only animals that get a rash from poison ivy.
69MQW TIL that American sculptor, Anna Coleman Ladd, crafted 185 face masks for returning First World War veterans with facial disfigurements from wounds.
W7R09 TIL Birds aren't actually blue, but appear to be due to an optical illusion caused by light interacting with the 3D structure of their feathers.