Body found at site of York University 's $ 100 million campus expansion . Investigator spotted an unusual yellow color inside the skull . CT scanner used to obtain clear images of the brain tissue . Expert : Survival of brain tissue where no other soft tissues are preserved is rare .
Skull found at site of York University 's $ 745 million campus expansion . Investigator spotted an unusual yellow substance inside the skull . Hospital scanner used to produce clear images of the brain tissue . Expert : Survival of brain remains where no other soft tissues are preserved is rare .