"The best card trick" http://mathoverflow.net/questions/9754/magic-trick-based-on-deep-mathematics/9914#9914 http://mathoverflow.net/questions/9754/magic-trick

"The best card trick" http://mathoverflow.net/questions/9754/magic-trick-based-on-deep-mathematics/9914#9914 http://mathoverflow.net/questions/9754/magic-trick-based-on-...