Various concept in the Callahan's Universe.
“The Law of Conservation of Pain was originally stated in "Laws of Conservation of Pain and Joy...The Law of Conservation of Pain
“Fivesight (an extension of foresight) is a form of precognition where the person sees future...Fivesight
“The Option at Callahan's Place (and it's successors) is the explanation of the peculiar ritual...The Option
“Transit is the term for teleporting living and non-living matter together without the aid of any...Transit
“Translation is the term for time-travel without the aid of any external device. Living and...Translate