my brain
Ontological paradox
http://en.wikipedia.org/wiki/Ontological_paradox
EX: A young physicist receives an old, tattered, disintegrating notebook containing various information about future events from his future self who has sent it back to him via a time machine; he copies it over into a new notebook before it deteriorates so badly as to be unusable. Over the years the predictions of the notebook come true, allowing him to become wealthy enough to fund his own research; which results in the development of a time machine, which he uses to send the now old, tattered, disintegrating notebook back to his former self. The notebook is not a paradox (it has an end and a beginning; the beginning where he receives it, the end where he threw it out after he copied the information), but the information is; it is impossible to state where it came from. The professor has transferred the information that he wrote himself, so there was no original notebook.
http://en.wikipedia.org/wiki/Ontological_paradox
EX: A young physicist receives an old, tattered, disintegrating notebook containing various information about future events from his future self who has sent it back to him via a time machine; he copies it over into a new notebook before it deteriorates so badly as to be unusable. Over the years the predictions of the notebook come true, allowing him to become wealthy enough to fund his own research; which results in the development of a time machine, which he uses to send the now old, tattered, disintegrating notebook back to his former self. The notebook is not a paradox (it has an end and a beginning; the beginning where he receives it, the end where he threw it out after he copied the information), but the information is; it is impossible to state where it came from. The professor has transferred the information that he wrote himself, so there was no original notebook.