I was watching a NOVA episode that talked about how there are clear signs that Earth's Magnetic Field is weakening at a fairly rapid rate -- a found it very interesting. According to the scientists interviewed, it's undeniably weakening but no one has an explanation. At its current rate of dissipation, the Earth's magnetic field will be absent in a thousand years. One theory, however, suggests that the Earth is preparing to shift poles (north becomes south and south becomes north). In the past this has happened fairly frequently (approximately once every 200,000 years). The thing is, it hasn't happened in the past 780,000 years and seems we are a bit overdue. Any opinions on whether you believe the Earth's magnetic field may be getting ready to flip?