Download a free audiobook version of “The 7 1/2 Deaths of Evelyn Hardcastle“ and support TED-Ed’s nonprofit mission: https://www.audible.com/ted-ed

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How do you know you’re a person who has lived your life, rather than a just-formed brain full of artificial memories, momentarily hallucinating a reality that doesn’t actually exist? That may sound absurd, but it’s kept several generations of top cosmologists up at night. They call it: the Boltzmann brain paradox. Fabio Pacucci explores this mind-numbing thought experiment.

Lesson by Fabio Pacucci, directed by Skirmanta Jakaitė, Art Shot.

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