I'll start this topic off with a simple question, if the answer to this is yes, then the questions following it are allowed to be answered.

1) Can I actually LEARN in a lucid dream. By this I mean for example, I'm having trouble in AP Physics (I really am). Could I read a book about it in the dream and learn it more effectively than in the realistic world?

2) If I can do "whatever I want" in a lucid dream, could I make this ginormous library appear with millions of books on everything in the world and in those books be topics like learning karate or sports knowledge and learn from that even though I've never studied them before?

I guess #2 were true, there would already be millions of really smart people out in the world. But if dreams can potentially show you the future which until it happens is unknown to everybody, why can't you learn about random topics that are unknown to you?

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Dreams are the most peculiar things in the world.