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Why flawed diamonds can sense neurons

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Flawless diamonds are scientifically useless. Introduce a nitrogen-vacancy center—a literal microscopic hole sitting right next to a rogue nitrogen atom in the carbon lattice—and suddenly you have an absurdly sensitive quantum magnetometer. These deliberately corrupted gems can detect the unimaginably faint magnetic fields generated by a single biological neuron firing in real time.

Why flawed diamonds can sense neurons
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