[thedoc (OP)]

Qualified London taxi drivers know their way around over 25,000 streets in the capital.  And, if you scan their brains, you find that the structure called the hippocampus is much bigger than it is in the average non-taxi driver.  But was it bigger to begin with, or did learning London like the backs of their hands trigger the cabbies brains to change?
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[CZARCAR]

headaches?