This movie was action packed. It introduced a little sci fi to antiqueties. I agree with the magnetism statement that if it was magnetic then why was it selective as to when and what it drew near. Reading about the crystal skulls natural light makes the skulls work. Just like humans natural light is needed to be active if you are kept in the dark you do not act or react well. Some of the stuff Indiana Jones was going after does test your thought on how it was made so far back in time. I found the skull part new and interesting. I think people look for an usual script. I do think Harrison Ford did a great job of portraing an older Indiana Jones. It leaves the door open for another Indiana Jones movie. We have had several James Bonds, why not more Indiana Joneses.