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6/10. Every so often, geologically speaking, the polarity of the Earth's magnetic field reverses. The timing of these reversals is unpredictable but recent dramatic dips in the Earth's magnetism could signal the beginning of another switch - an event not seen on this planet for nearly a million years. This and more news and views from the scientific world with Geoff Watts.
Producer Anna Buckley

Contributors

Unknown:
Geoff Watts.
Producer:
Anna Buckley
Source: Radio Times

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