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Matter wave interference of two freely expanding and overlapping Bose-Einstein condensates. The density of atomic sodium (vertical axis, in false color) is shown in an area of 0.1 millimeter by 0.4 millimeter containing about 50,000 atoms. The high-contrast interference fringes demonstrate that Bose-Einstein condensates are "laser-like," made of atoms occupying a single controllable quantum state. See page 637 and the related News story on page 617. [Image: Dallin Durfee]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)