No, you can't hike or spelunk or even tunnel down to the center of the Earth, even if movies like The Core or this summer's 3D adventure flick, Journey to the Center of the Earth, suggest otherwise. To find out about our planet's insides, scientists rely on very different tricks. And, apparently, a little luck.

Its blockbuster season, and that means mad scientists, angry robots and a certain flexibility with the laws of physics. Heres our guide to movies made especially with PopSci fans in mind. In it, a roundup of the season's best (and worst) geek candy, along with our expected gibberish quotient, so youll know which lines are pure comedy—even if no one else is laughing.