This month we explore how genetic plasticity enables sparrows to live alongside us and fish to evolve rapidly to life in caves. We also hear why "Test! Test! Test!" is so critical to safe healthcare provision during the coronavirus pandemic, how a new technique can find drugs that boost the fungal killing power of fluconazole, and how changes in land use have knock-on effects on soil-dwelling invertebrates... Get the references and the transcripts for this programme from the Naked Scientists website