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Science 23 March 2007:
Vol. 315. no. 5819, pp. 1672 - 1673
DOI: 10.1126/science.1140165
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Perspectives

PHYSICS:
How Does the Proton Spin?

Steven D. Bass

Protons are made of quarks and gluons, but their spins don't add up. New experiments may help resolve this discrepancy.

The author is at the Institute for Theoretical Physics, Universität Innsbruck, A6020 Innsbruck, Austria. E-mail: sbass{at}mail.cern.ch

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