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How a mysterious, super-powerful -- yet long-neglected -- microbe rules our world and can rescue our health in the age of antibiotic resistance.At every moment, within our bodies and all around us, trillions of microscopic combatants are waging a war that shapes our health and life on Earth. Countless times per second, viruses known as phages attack and destroy bacteria while leaving all other life forms, including us, unscathed. Vastly outnumbering the viruses that do us harm, phages power ecosystems, drive evolutionary innovation, and harbor a remarkable capacity to heal life-threatening infections when conventional antibiotics fail. Yet most of us have never heard of them, thinking of viruses only as enemies to be feared. The Good Virus prompts us to reconsider, and to discover, how these viruses could save countless lives if we can learn to harness their extraordinary abilities.