The time intervals between magnetic fields reversals have fluctuated widely,
but average about 300,000 years, with the last one taking place about 780,000 years ago.
Official talking heads all agree, it will be nothing to worry about. But no humans were alive then to record what happened.
The weakening of the Earth's magnetic field briefly transformed the world by altering its climate and allowing far more ultraviolet light to pour in.
Anyone noticing drastic changes in weather patterns lately?