In March 2020, Tagide deCarvalho saw something truly strange - something she thinks no other scientist has ever seen before: a virus with another, smaller virus latched onto its "neck." The backstory of this viral attachment is like a master class in how wild and weird biology can be. The two microbes are both bacteriophages, viruses that infect bacteria, that were harvested from a clump of dirt in Poolesville, Md. Bacteriophages, also called simply phages, are among the most abundant organisms