White House tries to broker deal between big banks and Attorneys General. Women granted voting rights in Saudi Arabia, but is it more than a symbolic move? Now that the red light cameras are gone, how about making the yellow traffic lights longer? Or making all four sides go red at the same time? RAND study says pot shops don't cause a spike in neighborhood crime. Later, how plants and animals - not just humans - changed after worlds collided. Charles C. Mann is here with his new book, 1493.