>> You could hear the neurons in her head grinding against each other when I
>> showed her how a fridge door seal works...  :)
>
>Did you tell her she's living on an enormously powerful magnet
>whose field reaches out thousands of miles into space?

Hmm, went to a talk this morning here at work where details were presented 
about this scheme that is afoot to do a "Star Trek" style shield from solar 
radiation for planetary travellers.

Apparently they reckon only about 50nT is needed to shield you from the 
plasma ejections from the sun ... 

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