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TIL the Swiss Federal Railways uses vibraphone melodies in announcements based on its Swiss national language acronyms: SBB (E♭-B♭-B♭) German, CFF (C-F-F) French and FFS (F-F-E♭) Italian. The tune and language vary by canton or country the train is in.

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5Ykar Our brains keep us 15 seconds 'in the past' to help us see a stable world
YpNax TIL of the film Wake in Fright. Once thought to be lost, an original unedited print was rediscovered by its editor after a fervent search in a shipping container labelled 'for destruction' one week before it was scheduled to be destroyed. The film today is considered a classic of Australian cinema.
j6MDQ TIL that footage from the video game Arma 3, a military sandbox game, has been mistaken for actual combat footage and has been used in news reports a number of times due to the realistic nature of the game.
gMJo7 TIL it's possible for complex communications with someone who is dreaming. Researchers of one study found two-way communications during REM sleep is possible when study participants (having confirmed lucid dreams) answered questions correctly via eye movement - even solving simple math equations.
oBAPL TIL it’s a myth that burning witches alive was a common practice. The myth that is generally accepted for the Salem witch trials originated with the European witch trials where a witch was hung/beheaded then burned to prevent postmortem sorcery.