Today is all about duality. Is a tragic event better written about as a personal essay, or as straight reportage? Should visitors to LA check out the Book Festival or the Grilled Cheese Festival? Tough decisions abound. At the heart of the episode is our comparative study on two essays: Jo Ann Beard’s “The Fourth State of Matter,” and Jim Mann’s “The Physics of Revenge.” Each one unpacks the same cultural event using wildly different techniques. Which form of nonfiction will prevail?