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Math Trek

A knot of light

Researchers find a new theoretical way to tie light into complex knots and links.

By
5:27pm, September 12, 2008

Imagine twisting a beam of light into a knot, as if it were a piece of a string. Now grab another light beam and tie it around the first, forming its own loop. Tie on another and another, until all of space is filled up with loops of light.

Sounds preposterous, but a pair of physicists has shown that light can do just this — at l

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