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Earth’s north magnetic pole is moving from Canada towards Siberia. Has there been a noticeable effect on migrating animals that sense the geomagnetic field as a navigation aid?
Bob Werner,
Pasadena, California, US
Samuel Perales Carrasco/Alamy
Why is it harder to remove a crease from a shirt with an iron than to put one in?
Matthew Bradby,
London, UK
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