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I think it is all about how good you are at making casual observations of your surroundings, the scenery, and almost subconsciously remember how many left or right turns you've made. I would compare it to solving a jig-saw puzzle, some people are just good and otheres are not, so these people cannot mentally visualise what they see and do, so they end up hopelessly lost.  Just my opinion though...
Magnetite biomineralization in the human brainJOSEPH L. KIRSCHVINK, ATSUKO KOBAYASHI-KIRSCHVINK, AND BARBARA J. WOODFORD*Division of Geological and Planetary Sciences, The California Institute of Technology, Pasadena, CA 91125Communicated by Leon T. Silver, May 7, 1992ABSTRACT Although the mineral magnetite (Fe3O4) is precipitated biochemically by bacteria, protists, and a variety of animals, it has not been documented previously in human tissue. Using an ultrasensitive superconducting magnetometer in a clean-lab environment, we have detected the presence of ferromagnetic material in a variety of tissues from the human brain. Magnetic particle extracts from solubilized brain tissues examined with high-resolution transmission electron microscopy, electron diffraction, and elemental analyses identify minerals in the magnetitemaghemite family, with many of the crystal morphologies and structures resembling strongly those precipitated by magnetotactic bacteria and fish.
I have a good sense of direction, being as I go all over the place for one thing or another, I do find I can remember details of how to get from A to B even if I have not done the journey for a very long time.BUT, (stressed for a purpose) I have never been able to get the hang of Milton Keynes, it seems to me that all roads look much the same. I recall a time when after much larking around, I finally found the place I was looking for and said to a fella working there 'Its taken me ages to find this **** place, I hate Milton Keynes.' His reply was, 'Think yourself lucky you don't live here, some people leave home for work and can't find their way back!'I put it down to the similarity between roads.