At first, it sounded too good to be true: grass that never died, never wilted, and never gave way to weeds. Major league baseball hailed it as one of the greatest innovations in the world of professional sports. As thousands and thousands of 'astroturf' fields sprouted up across the US and Canada -- and then spread to playgrounds -- adults and children alike enjoyed seas of endless, verdant green. Until, that is, the reports came in. In today's episode, Ben, Matt and Noel slide headlong into the home base of a troubling conspiracy decades in the making: Does artificial turf give you cancer?