To kill the competition, bacteria throw pieces of dead viruses at them
Briefly

Long before humans became interested in killing bacteria, viruses known as phages attacked bacteria, contributing to genetic diversity. Bacteria have evolved to repurpose disabled virus pieces as weapons against competitors, maintaining diverse populations.
Researchers discovered bacteria carrying pieces of disabled viruses in their genomes, potentially aiding in the competition for resources. This process has contributed to maintaining diverse bacterial populations for centuries, showcasing the adaptation of bacteria to utilize viruses as tools.
Read at Ars Technica
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