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MRI machines use liquid helium to cool superconducting coils

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To scan your brain, a hospital literally builds a magnet strong enough to rip a chair across the room. To keep it from exploding from its own electrical resistance, the coils are bathed in liquid helium at nearly absolute zero. It is essentially a freezing, super-powered death trap optimized to find tumors.

MRI machines use liquid helium to cool superconducting coils
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