Dmitry Lovetsky
In this photo taken late Sunday, March 28, 2010, Lubov Perelman, mother of Russian mathematician Grigory Perelman, 43, is seen through a window of their apartment in St. Petersburg, Russia. On March 18, 2010, the Clay Mathematics Institute of Cambridge, Mass, announced it had awarded Grigory Perelman a $1 million Millennium Prize for solving a problem that has stumped mathematicians for a century. (AP Photo/Dmitry Lovetsky)
