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TIL That children from Roosevelt's family would crawl through the space between ceilings and floors in the White House, where no living being but rats and ferrets had been for years.

QNPlE TIL that in 1983, a diving chamber containing four men was accidentally depressurized. This caused the blood of three divers inside to boil instantly, while the fourth diver was forced through a 60 cm (24 in) opening, causing his body to fragment and all of his internal organs to be expelled.
0oVN TIL that during the Civil Rights Movement, the Soviet Union purposely inflamed racial tensions by mailing forged threats from the KKK to black neighborhoods
QJKnL TIL that Hugh Laurie struggles with severe clinical depression. He first became aware of it when he saw two cars collide and explode in a demolition derby and felt bored rather than excited or frightened. As he said: “boredom is not an appropriate response to exploding cars".
4XJew TIL that Dr. Strangelove was originally conceived as a drama about the nature of nuclear warfare, but as Kubrick was writing the screenplay, he felt many of the accurate depictions of nuclear warfare policy were too unbelievable for audiences to take seriously, and so it was turned into a comedy.
AN6pd TIL: The "Simple Sabotage Field Manual" was declassified in 2008 and it contains advice on how spies can sabotage the enemy by just being maliciously incompetent. Advice include praising inefficient coworkers, cry and sob frequently at work, asking inane questions in meetings, and spreading gossip.