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TIL Europa is the smoothest object known in the solar system

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dDRR8 TIL the song Dumb Ways to Die has been attributed with up to a 30% reduction in near miss train accidents during the following 12 months after its release
OGYV4 TIL of the Oriflamme. It was the battle standard of the King of France during the Middle Ages. When raised during battle, no prisoners were to be taken until it was lowered
78NvM TIL that the Dunning–Kruger effect is a cognitive bias where people with low ability at a task overestimate their ability because they lack the self-awareness to recognize their own incompetence.
5YmOQ TIL gastrolith is a term for when animals store small rocks in their gastrointestinal tract and use them to grind food when they lack the suitable teeth.
JYp6l TIL that the children's group 'The Wiggles' developed their signature "wiggles fingers" so that in photos with children, people would always know where there hands are.