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    ‘Dating is absolutely crucial, it underpins everything,’ says Michael Walker.

    Based at the University of Wales Trinity St David, he has devoted his career to studying the Quaternary period – the last 2.6 million years and the so-called ‘age of humans’.

    This term means that older artefacts are usually found below younger items.Working with several collaboraters, Libby established the natural occurrence of radiocarbon by detecting its radioactivity in methane from the Baltimore sewer.In contrast, methane made from petroleum products had no measurable radioactivity.Though originally a field reserved for archaeologists, physical scientists like Walker are showing that they also have crucial contributions to make.With the help of new physical and chemical dating methods, scientists are finally beginning to discover how and when archaic species became…

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