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Nature 404, 240-241 (16 March 2000) | doi:10.1038/35005205

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High-pressure physics: The element of uncertainty

Russell J. Hemley

Consider a box containing an equal number of electrons and protons — what could be simpler? If the box is large enough, this ensemble of particles spontaneously forms a collection of hydrogen molecules (H2), as both theory and experiment most certainly agree.