Science Fiction, mostly the hard type.

I would like to know what you guys consider the best in hard sci-fi. When I say hard I mean stories that go someway to explain how whatever fantastic situation the book deals with could theoretically be possible.

For example im about halfway through Eon by Greg Bear and ive not long read Renevous With Rama by Arthur C. Clarke too.

I FUKKEN LOEV SCI-FI

Does Foundation really count as hard sci-fi? Either way, all seven are worth your time. Damn hard to find them all, though.