dr. anthony zakaria has experienced it. >> i was clinically dead. a lightning strike in 1994. >> lightning and hit the building and exited through the phone and i happen to be in the way. so it hit me in the face and just sent me flying backwards. >> been something unexplainable. >> i was completely separated and i was going someplace else. >> surrounded in a bluish white light. >> in that white light was truly the most amazing feeling. if you can imagine absolute love and peace. >> are are practicing and successful orthopedic surgeon was revived in the two decades since, he taught himself how to play the piano compositions he says come from the other side. a man of medicine. how do you explain that? >> you know i've struggled with this all of my adult life. we have evidence that in many examples where people have described these so-called near-death or actual death experiences they are not hallucinations. >> stony brook university researcher helps conduct the largest ever study and near-death experiences. >> the people i've studied or only those wh