The recent ARRIGE kick-off meeting in Paris had the pleasure to have Francisco Juan Martínez Mojica (Francis Mojica), microbiologist from the University of Alicante (Spain), delivering the first keynote lecture of the conference. In his very interesting talk, Francis Mojica reviewed the origins of the CRISPR systems in prokaryotes, as part of an ancient acquired immune defense system, and their recent conversion into powerful genome editing tools. He is convinced that we are just beginning to understand the unexpected complexity of bacterial immune systems. CRISPR could be just one of many, yet to be identified and described. There is a great future ahead in the field of Molecular Microbiology for discovering new CRISPR and CRISPR-like systems that could be transformed and adapted for the efficient and safe manipulation of genomes, including the human genome.