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Earth's geomagnetic field normally reverses a few times every million years, but during "superchron" periods, this switching process may stop for 30 to 50 million years. In his Perspective, Banerjee highlights the study by Tarduno et al. , who have deduced the paleomagnetic field strength during the Cretaceous superchron from magnetite inclusions in lavas found in India. The results may provide clues to what causes the superchron periods.