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TIL in the 1920s Helene Adelaide Shelby patented a device to help obtain criminal confessions. The suspect was confronted by a human skeleton with glowing red eyes and the interrogator would talk through the skeleton via megaphone. A camera in the skull would record the confessions.

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pYdVe TIL FedEx planes are equipped with anti aircraft defence systems.
rZxM TIL that after the Columbine High School massacre, Marilyn Manson trademarked his stage name so he could issue cease and desist orders to silence media who were wrongly blaming him for inspiring the killers
16RoO TIL Kitum Cave, Kenya, believed to be the source of Ebola and Marburg, two of the deadliest diseases known to man. An expedition was staged by the US military in the 1990s in an attempt to identify the vector species presumably residing in the cave. It is one of the most dangerous places on Earth
9YZgB TIL Henry "Box" Brown escaped slavery in the American south by mailing himself to freedom. He had friends pack him into a small box, and ship him as cargo from Richmond to Philadelphia. He survived, and went on to work as a magician
0OmR TIL helium molecules are so small that they bleed through the rubber in balloons, causing them to deflate and become floppy, unfloaty & sad.