The USSR's bans on Jews
In November 2002 the Russian mathematician Grigori Perelman posted his proof of the Poincaré conjecture on the internet. The conjecture had been formulated in 1904 by the French mathematician Henri Poincaré and is no abstract, dusty problem, but deals with the possible shape of our universe. By 2006 Grigori Perelman’s solution had become widely accepted. He was awarded the Fields Medal (the maths version of the Nobel Prize), had jobs offers from leading universities, and was awarded $1 million (the Clay Institute prize for solving one of the seven “Millennium” maths problems). Perelman refused...