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TIL in Denmark in WWII, border guards would screen homecoming Danes by making them say the name of a dessert: rødgrød med fløde. Due to its difficulty in pronunciation, German infiltrators could not pass the test.

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gMpj4 TIL Amazon Web Services offers a service called Snowmobile, where they will bring you a truck with 100 Petabytes worth of hard drives, copy your data, then drive it to its destination, bypassing the internet entirely. Transferring this much data over a 1Gbps line would take 20 years.
E1MAp TIL the Saturn V rocket carrying the Apollo 12 mission was hit twice by lightning. 36.5 seconds after launch. lightning hit as it ascended the cloud layer, setting off alarms due to guidance systems errors. 15 second later it was hit again and instruments no longer displayed meaningful information
b6Zma TIL a safety alert error resulted in Hawai residents spending 18 minutes bracing for an incoming ballistic strike
b675j TIL: Weezer's first gig was opening for Keanu Reeves' band Dogstar
QW99 TIL that Fidonet, a pre-internet networking technology, still exists and is used today