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Bacteriophages are viruses that infect bacteria rather than human cells. Scientists can engineer them to target bacteria that resist many drugs while leaving many helpful bacteria alone. Some phages can also break down the protective layers that make bacterial infections hard to treat.

Britain's interwar sound-listening mirrors could detect faster aircraft only when they were already too close to engage, so they could not give effective warning. The program did develop ways to link listening stations and plot aircraft movements. The early radar team received those methods, which contributed to its success in World War II.