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The definition of life is in flux, complexity is overrated, and humans are shrinking.\nViruses are supposed to be sleek, pared-down, dead-eyed machines. But when one microbiologist stumbled upon a GIANT virus, hundreds of times bigger than any seen before, all that went out the window.\xa0 The discovery opened the door not only to a new cast of microscopic characters with names like Mimivirus, Mamavirus, and Megavirus, but also to basic questions: How did we miss these until now? Have they been around since the beginning? What if evolution could go \u2026 backwards?\nIn this episode from 2015,\xa0 join former co-hosts Jad Abumrad and Robert Krulwich as they grill Radiolab regular Carl Zimmer on these paradoxical viruses \u2013 they\u2019re so big that they can get their own viruses! - and what they can tell us about the nature of life.\xa0\nOur newsletter comes out every Wednesday. It includes short essays, recommendations, and details about other ways to interact with the show. Sign up (https://radiolab.org/newsletter)!\nRadiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.\nFollow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org.\n\nLeadership support for Radiolab\u2019s science programming is provided by the Gordon and Betty Moore Foundation, Science Sandbox, a Simons Foundation Initiative, and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.