A new estimate of the ghostly particle’s maximum possible mass brings physicists a tad closer to understanding the universe.

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This long-lived Schrödinger-cat state paves a new way for atomic magnetometry, quantum computations, and the exploration of new physics beyond the Standard Model. Reference: “Minute-scale ...

ENGLISH readers will welcome this authoritative account by Prof. Bohr of the application of his theory to atomic structure. The essay has been translated from the Zeitschrift fur Physik by L.