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Old 12th Jan 2019, 10:03
  #15 (permalink)  
DaveReidUK
 
Join Date: Jan 2008
Location: Reading, UK
Posts: 10,263
Originally Posted by Capt Fathom View Post
It has? When?
Most recently, about 780,000 years ago.

I don't think that one caused any problem for pilots.

Brunhes–Matuyama reversal
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