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Fragments of mitochondrial DNA and a protein sequence for osteocalcin are recovered from 55,000-year-old fossilised bison bones. Faulty water safety test kits fail to detect arsnic in drinking water in Bangladesh. Why do leaves on some trees turn bright colours in autumn? Some plants need fire to germinate, so should we let some fires burn? Learning the language of marine danger. How seals tell friend from foe by sound.