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    World’s Only Sample of Metallic Hydrogen Disappears

    As the scientific method says, replication is key. Harvard researchers reported last month that they’d managed to create metallic hydrogen — which can superconduct electricity at room temperature without resistance — by using massive amounts of pressure and a diamond vice. Now they say the sample, which was stored at a temperature near absolute zero, has disappeared, though they couldn’t tell whether it had been moved or simply evaporated. Next the scientists will attempt to recreate their experiment and make more of “the holy grail of high-pressure physics.”

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