How Could We Miss It?

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Science  06 Apr 2001:
Vol. 292, Issue 5514, pp. 65-66
DOI: 10.1126/science.1060380

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The recent discovery that the simple, well-known compound MgBis superconducting at 39 kelvin has galvanized the superconductivity research community into action. In his Perspective, Campbell discusses why this compound was overlooked and how its properties compare with known classes of superconductors.