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Hierarchy of Exchange Interactions in the Triangular-Lattice Spin Liquid <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbMgGaO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
A newly synthesized compound, YbMgGaO${}_{4}$, appears to have the proper interactions among neighboring spins to create a quantum spin-liquid state, an exotic phase that could be useful for some approaches to quantum computing.