TWiV 212: Apocalypse TWiV 122112 212

On episode #212 of the science show This Week in Virology, the TWiVerers answer listener email about genetically modified chickens, a hendra vaccine for horses, online education, curing color blindness, Roosevelt and polio, Th cells, and much more. You can find TWiV #212 at www.microbe.tv/twiv.