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Bosons form quantum threesome The way physical objects interact with each other becomes very complicated when more than two objects are involved. For example, while Newton's theory of gravity can describe how a single planet orbits the Sun, the equations are impossible to solve exactly if we add just one more planet to the system. Now, however, physicists in Austria have confirmed a rare prediction of a three-body "Efimov" state in a gas of ultracold caesium atoms.
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