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Two magnetically suspended bismuth spheres vibrating freely in a liquid containing finely crushed bismuth. The streaks are due to horizontal streaming flow of the highly reflective metal grains. Selected for a Synopsis in Physics and an Editors’ Suggestion. [H. A. Pacheco-Martinez, L. Liao, R. J. A. Hill, Michael R. Swift, and R. M. Bowley, Phys. Rev. Lett. 110, 154501 (2013)] |
