This two-part special edition kicks off Season Five of "Plants of the Gods: Hallucinogens, Healing, Culture and Conservation." We start by asking the question that is on everyone's mind these days: did civilization invent beer, or did beer invent civilization? And then we help solve a cold case: did ancient Africans know and use antibiotics? And why are we asking this in a discussion of beer? And is there really a 10 CD set comprised entirely of German beer drinking songs? And what did the late Frank Zappa say – and sing – about beer?