Like philatelists filling the last empty space in a series of cherished stamps, physicists have now found the last subatomic particle that is needed to make the universe neatly and electrically ...
Strange matter Illustration of how antihyperhelium-4 – a bound state of two antiprotons, an antineutron and an antilambda – is created in lead–lead collisions at CERN. (Courtesy: CERN/ J Ditzel with ...
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