Earth’s magnetic field flipped 42,000 years ago, extinctions and upheaval followed: Study

Scientists were aware of a temporarily flip in the magnetic poles some 40,000 years ago, but not if & how it impacted life on Earth.

from http://www.firstpost.com/tech/science/earths-magnetic-field-flipped-42000-years-ago-extinctions-and-upheaval-followed-study-9331021.html