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TIL Egyptian blue, also known as calcium copper silicate (CaCuSi4O10 or CaOCuO(SiO2)4 (calcium copper tetrasilicate)) or cuprorivaite, is considered to be the first synthetic pigment.

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e0RwD TIL that the first guy to claim that AIDS wasn't caused by HIV (and instead the victims' lifestyles) died of AIDS.
71DZ TIL murderer and suspected serial killer Charles Davis raped and strangled his victims and left them on his ambulance route. He would phone in tips and then respond in his ambulance to retrieve the bodies.
Oowke TIL about Rubber Duck debugging, a name for solving a problem by trying to explain it to someone else
oyWK TIL of the “Madagascar Plan”, a proposal of the Third Reich to relocate the Jewish population of Europe to the island of Madagascar
nW547 TIL that there were only 4 times a US vice president assumed temporary presidential powers as acting president, and each time was due to the president having a colonoscopy.