An Ötzi sandwich, anyone? Intestinal yeast from a 5,300-year-old ice mummy produces perfect sourdough

He died more than 5,000 years ago in the icy cold of the Alps, but at a microscopic level the world’s most famous ice mummy is still very much alive. Scientists discovered ancient yeast in his intestines and didn’t stop there: they grew it and even baked a perfect sourdough bread with it. A ‘prehistoric’ Ötzi sandwich, do you dare?

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