Euangelion original explanatory graphic. Created for the October 6, 2026 edition. Author: Euangelion. Copyright: Euangelion, 2026. Permission is granted to reproduce this original graphic with attribution and its complete caption, without implying endorsement. Source basis: https://www.nature.com/articles/s41587-026-03334-7 Conceptual RNA-to-DNA recording, not measured time courses or quantities. A target RNA activates barcode production in engineered bacterial cells; the DNA can be read by sequencing. The drawing does not imply permanent storage or demonstrated use in people. No third-party photograph, figure, artwork or layout is reproduced.