Today on DnA, oil, plastic and the stuff that surrounds us. As oil \nspills into the gulf, we examine our dependence on products derived from\n petrochemicals, with Chris Lefteri, Sara Banaszak, Carla\n Denker\nand Kevin Hanley. Also, a look at an icon of the oil age: the \nnewly renovated LAX Theme \nBuilding, with guests Scott Markle, Millard Lee and \nAlastair Gordon.