Dr. Raquel Gomez Pliego prepares «super tortillas» at the Industrial Microbiology laboratory of the National Autonomous University of Mexico (UNAM) in Mexico City on April 10, 2025. Peering through a microscope, food scientist Raquel Gomez studies microorganisms that add nutrients and help to preserve tortillas for longer without refrigerators that are a luxury in impoverished Mexican communities. (Photo by Carl de Souza / AFP)
