A good friend of mine referred me to this article concerning the same subject, I believe it is better written then the first.
"Magnetic bones in human sinuses
R. Robin Baker, Janice G. Mather & John H. Kennaugh
Department of Zoology, University of Manchester, Manchester M13 9PL, UK
Studies on the interaction of magnetic fields and biological organisms1 have centred on the influence of applied magnetic fields on the physiology and behaviour of organisms, including humans, and a search for magnetic sources within the organisms themselves. Evidence continues to accumulate that a wide range of organisms, from bacteria to vertebrates, can detect and orient to ambient magnetic fields (for examples see refs 2−4). Since the discovery that magnetic orientation by bacteria was due to the presence within the organism of magnetic particles of the ferric/ferrous oxide, magnetite5,6, the search has begun for other biogenic deposits of inorganic magnetic material and ways in which the possession of such material might confer on the organism the ability to orient to ambient magnetic fields. Such magnetic material, often identified as magnetite, has been discovered in bees7, homing pigeons8,9, dolphins10 and various other organisms4, including man11. A variety of hypotheses for the use of magnetite in magnetic field detection have been proposed12,13. We report here that bones from the region of the sphenoid/ethmoid sinus complex of humans are magnetic and contain deposits of ferric iron. The possible derivations and functions of these deposits are discussed."
I tried to attatch another, older, article concerning the same object but could not due to it was not a jpg, gif, or kml file. Anyway, it says bassically the same thing. If you can find it it is titled, "Ferromagnetic Crystals (Magnetite?) In Human Tissue" by Joseph L. Kirschvink. I don't think it is readily available...my friend, who is in some form of biological studies at the University of Minnesota, said that she could get it through the University and was afraid that it wouldn't allow me to open it. But anyway, it just says, bassically, the same things that the other two have already said. It's just a bit more indepth concerning some points.