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Science 21 November 2008:
Vol. 322. no. 5905, pp. 1198 - 1199
DOI: 10.1126/science.1166844
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Perspectives

PHYSICS:
The Weight of the World Is Quantum Chromodynamics

Andreas S. Kronfeld

Ab initio calculations of the proton and neutron masses have now been achieved, a milestone in a 30-year effort of theoretical and computational physics.

Theoretical Physics Group, Fermi National Accelerator Laboratory, Batavia, IL 60510, USA. E-mail: ask{at}fnal.gov

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Science. ISSN 0036-8075 (print), 1095-9203 (online)