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Aging tissues accumulate somatic mutations, yet cancer occurrence is relatively rare. A new study provides compelling evidence for why this may be the case and reveals that competition between mutant clones in oesophageal tissues protects against early tumorigenesis.The ability to harvest reducing power from molecular hydrogen was once considered a prokaryotic trait. New research challenges this notion by finding the first eukaryotic organism capable of oxidizing hydrogen.When plants are starved of phosphate, many rely on an ancient symbios