Every 500,000 years or so, the Earth’s magnetic field literally turns on its head, so that north is south and south is north. Many scientists say we’re long overdue for the next magnetic shift, which would have a dramatic effect on everything from compasses to migratory birds to satellites.

Guests

  • Robert Coe Professor of Earth Sciences, University of California Santa Cruz
  • Coerte Voorhies Geophysicist, Geodynamics Branch, Laboratory for Terrestrial Physics, NASA’s Goddard Space Flight Center

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