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Science 9 February 2001:
Vol. 291. no. 5506, p. 965
DOI: 10.1126/science.291.5506.965a
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News of the Week

KNOT THEORY:
Loopy Solution Brings Infinite Relief

Charles Seife

Mathematicians have finally made their first stab at figuring out how long it takes to untie a knot. The answer, for one key class of knots, is "not forever"--and even that comes with a huge string attached. Still, knot researchers are delighted.

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