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Ships shed light on geomagnetic field Geophysicists in the UK have used a mathematical model based on old ships' logbooks to show that the observed decline in the strength of the Earth's magnetic field may only be a recent phenomenon -- and not a fixed trend as commonly thought. David Gubbins and colleagues at Leeds University say that our planet's magnetic field was stable until the mid-1800s and has been weakening steadily only since then.
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