I don't know if anyone discussed this before, but it's been bugging me for a while.
It's supposed to be impossible to bring information back more than six hours with any combination of time turners. The obvious method would be that once someone delivers a message to you from the future, you can no longer go back in time further than six hours before when they're from. This wouldn't really work. Every time you travel back, you bring the information that you were not stopped by a time-traveler. Either the time turner never works, or anyone that's going to use one will be somehow completely immune to anything a time traveler does. They could send a black hole from the future that devours the planet, and you'd have to not only survive, but not even notice. Or, at least, you'd have to have a doppelganger that appears to come back from the post-black hole future but doesn't know about it.
You're right. In fact, in the story we already have questionable use of information travel:
There was another pause, and then Madam Bones's voice said, "I have information which I learned four hours into the future, Albus. Do you still want it?"
Albus paused -
(weighing, Minerva knew, the possibility that he might want to go back more than two hours from this instant; for you couldn't send information further back in time than six hours, not through any chain of Time-Turners)
- and finally said, "Yes, please."
If there were a hard limit ...
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This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 85. The previous thread has long passed 500 comments. Comment in the 15th thread until you read chapter 85.
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