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Breakthrough: Baking Sourdough with 5,000‑Year‑Old YeastScientists have successfully baked a sourdough loaf using yeast strains isolated from the 5,000‑year‑old Alpine mummy known as Ötzi the Iceman. The experiment demonstrates that ancient microorganisms can still perform modern fermentation processes.How the Ancient Yeast Was Extracted and TestedResearchers from Eurac Research's Institute for Mummy Studies carefully sampled the microbial layer on Ötzi’s skin and clothing, then cultured the yeast under cold‑room conditions before introducing it into a standard sourdough starter.Source: Ötzi’s preserved remains, discovered 1991 near the Italy‑Austria border.Age of yeast: ~5,000 years.Lead microbiologist: Mohamed Sarhan.Fermentation time: dough rose in 24 hours, comparable to modern baker’s yeast.Scientific Metrics: Fermentation Times and ViabilityThe ancient yeast produced a normal rise within 24 hours, indicating viable metabolic activity despite millennia of dormancy. No quantitative yield data were released, but the rapid leavening suggests comparable enzymatic efficiency to contemporary strains.Implications for Food Science and ArchaeologyThis result bridges paleomicrobiology and culinary science, offering a tangible link to prehistoric food practices. It also opens avenues for studying ancient microbial genetics, which could reveal lost fermentation traits.Next Steps: Brewing Beer and Expanding Ancient Microbe ResearchThe team plans to collaborate with German brewer Weihenstephan to test the yeast’s suitability for beer production. Further investigations will assess the genetic profile of the strain and explore other potential applications in food and biotechnology.