Many times through deep history Earth's magnetic poles have switched places, leaving our planet's protective shield weaker and life vulnerable to devastating solar storms. The last time it happened wa
Many times through deep history Earth's magnetic poles have switched places, leaving our planet's protective shield weaker and life vulnerable to devastating solar storms. The last time it happened wa
An engrossing history of the science of one of the four fundamental physical forces in the universe, electromagnetism, right up to the latest indications that the poles are soon to reverse and destroy
