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• arclein
Astrophysics at the University of Colorado, researchers made an agglomeration of electrons and holes that was bigger than any created before — 200 nanometers, or billionths of a meter, across. That is almost big enough to see with a good microscope, about one-50th the thickness of a cotton fiber. Before now, physicists had created two-pair groups of electrons and holes, but never such an agglomeration that could form this liquid-like quantum droplet or dropleton. [Wacky Physics: The Coolest Little Particles in Nature]

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