On November 14, the Institute for Advanced Study announced
the appointment of Robbert Dijkgraaf as its ninth Director,
succeeding, as of July 1, 2012, Peter Goddard, who has served as
Director since January 2004.
In the twentieth century, mathematicians developed a deep
theory of knots, which was revolutionized by the discovery of the
Jones polynomial—a way to calculate a number for every
knot—by Vaughan F. R. Jones in the early 1980s. Below, Edward