Scientists understand that Earth's magnetic field has flipped its polarity many times over the millennia. In other words, if you were alive about 800,000 years ago, and facing what we call north with ...

Prior to my retirement in late 2016, John Delano received research funding from NASA. No current funding. John Delano is currently a volunteer interpreter at three sites in Colonial Williamsburg, VA.

Scientists understand that Earth’s magnetic field has flipped its polarity many times over the millennia. In other words, if you were alive about 800,000 years ago, and facing what we call north with ...