Stephen Wolfram: Computing a theory of everything. Dan Cobley: What physics taught me about marketing. Marcus du Sautoy: Symmetry, reality's riddle. Sean Gourley on the mathematics of war. Arthur Benjamin does "Mathemagic" Bruce Bueno de Mesquita predicts Iran's future. Robert Lang folds way-new origami. Benoit Mandelbrot: Fractals and the art of roughness. Dan Meyer: Math class needs a makeover. Conrad Wolfram: Teaching kids real math with computers. Arthur Benjamin's formula for changing math education.