John Stewart Bell

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1. 01

   Two particles that once touched can stay linked forever, so measuring one instantly affects the result of the other, no matter the distance.

   Speakable and Unspeakable in Quantum Mechanics · 1987

   Measuring one particle instantly influences the state of the other, no matter how far apart.

   Imagine two magic dice that, no matter how far apart they are thrown, always show linked numbers. Bell showed with a precise calculation that no hidden trick can explain this — the link is genuinely real. Einstein called it spooky action at a distance and did not like it at all.

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