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Caption: Quantum mechanically, mass can be used to measure time and vice versa. This image relates to a paper that appeared in Jan. 10, 2013, issue of Science Express, published by AAAS. The paper, by S.-Y. Lan at University of California, Berkeley in Berkeley, CA, and colleagues was titled, "A Clock Directly Linking Time to a Particle’s Mass."
Credit: [Image courtesy of Pei-Chen Kuan]
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