108 Progress toward Cyberimmortality the personality are encoded in the shape of the network of connections  linking  neurons.  “Self  lives  in  the  synapses,” might be the motto of this viewpoint. Actually, much smaller structures may also play a role, either inside the neurons or on their surfaces near the synapses. It has even been suggested that the glial cells, which outnumber neurons in the brain, are not merely supportive tissue but have some active function in thought or memory. Granting that further research is needed, let us assume for present purposes that a mind really does consist of the momentary structure of neuronal connections. At present, we can only imagine how that fine structure might be mapped. Magnetic  Resonance  Imaging  (MRI),  Computer  Assisted Tomography (CAT scans), Positron Emission Tomography (PET scans), Electroencephalography (EEGs or brain waves), and infrared observation are non-destructive ways of studying the brain. However, all of them have rather poor resolution. For example, MRIs are generally unable to resolve features smaller than a cubic millimeter, whereas thousands of neurons may jostle each other within this space. To see smaller struc- tures requires increasing the power of the MRI scan, but this is dangerous and violates government regulations for research on human subjects. Perhaps computer analysis techniques can improve the resolution somewhat, but several of these meth- ods already use sophisticated software, so we cannot count on really dramatic advances without a fresh approach. [4] Unfortunately, at the present time it is difficult to see how the brain’s detailed structure could be mapped without destroy- ing it. In the Visible Human Project of the National Library of Medicine of the National Institutes of Health, two deceased human beings were frozen and then sliced so that their cross sections could be photographed, from head to toe. The images were  then  computerized  so  that  three-dimensional  models could be made of any of the organs. The resolution was at