If scientists shine a single particle of light on a screen, the particle does something strange: It shows up in two places at once.
如果科学家将单个的光粒子投影在屏幕上，光粒子有奇怪的反应：它会同时在两个地方显像。
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A quantum property of the charm quark whose conservation explains the absence of certain strange-particle decay modes and that accounts for the longevity of the J particle.