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Credit: University of California - Berkeley It's not as bizarre as it sounds.

Earth's magnetic field has flipped – though not overnight – many times throughout the planet's history.

And since Earth's magnetic field protects life from energetic particles from the sun and cosmic rays, both of which can cause genetic mutations, a weakening or temporary loss of the field before a permanent reversal could increase cancer rates.

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Though a magnetic reversal is a major planet-wide event driven by convection in Earth's iron core, there are no documented catastrophes associated with past reversals, despite much searching in the geologic and biologic record.Today, however, such a reversal could potentially wreak havoc with our electrical grid, generating currents that might take it down.

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