Other studies have suggested Einstein's, well, Einstein-iness may have been the result of an unusually high number of brain cells known as glial cells, which surround neurons. This is the first study to look at the genius's corpus callosum. However, the current study does compare pictures of a dead, preserved brain with MRIs of live, working brains, so there may be some limitations in the data. But the authors note that because of the resolution of the MRI, the scans might show the corpus callosum in the control brains as being slightly thicker than it is in real life. Einstein's brain tissue might have shrunk a little during preservation, too, so there's a possiblity the differences could have been even more stark.