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Harry Potter and the Nightmares of Futures Past
by S'TarKan reviews
The war is over. Too bad no one is left to celebrate. Harry makes a desperate plan to go back in time, even though it means returning Voldemort to life. Now an 11 year old Harry with 30 year old memories is starting Hogwarts. Can he get it right?
Harry Potter - Rated: T - English - Adventure/Romance - Chapters: 42 - Words: 419,605 - Reviews: 14581 - Favs: 20,228 - Follows: 19,863 - Updated: 9/8/2015 - Published: 10/28/2005 - Harry P., Ginny W.
Harry Potter and the Methods of Rationality
by Less Wrong reviews
Petunia married a biochemist, and Harry grew up reading science and science fiction. Then came the Hogwarts letter, and a world of intriguing new possibilities to exploit. And new friends, like Hermione Granger, and Professor McGonagall, and Professor Quirrell... COMPLETE.
Harry Potter - Rated: T - English - Drama/Humor - Chapters: 122 - Words: 661,619 - Reviews: 32232 - Favs: 19,207 - Follows: 15,672 - Updated: 3/14/2015 - Published: 2/28/2010 - Harry P., Hermione G. - Complete