Chemical Physics2026-01-122 minarXiv:2601.07614expressA Nuclear Compass in a Test TubeA magnetic compass in a test tube sounds like a magic trick, but it's pure physics. In a solution of fumarate (a salt of malic acid), carbon-13 nuclei behave like tiny spinning tops.James Eills·Anushka Singh·Amir-Mahyar Teimoori·Irene Marco-Rius·Morgan W. Mitchell·Michael C. D. TaylerWolfgang PauliNMR spectroscopynuclear spin👍👎☆SimplePopularAdvanced