The Earth's magnetic poles have reversed in the past, but the last swap happened before modern humans existed. When is the next pole swap due, and what will happen to us? Show more
Discover 11,128,835 listings and 278,316 playable programmes from the BBC
The Earth's magnetic poles have reversed in the past, but the last swap happened before modern humans existed. When is the next pole swap due, and what will happen to us? Show more