XKCD creator Randall Munroe wrote about Einstein’s two theories of relativity for the New Yorker. It’s well worth your time — trust me:
When you get answers that don’t fit together, it can make you feel like you’re not very good at thinking. Or, if you’re the kind of person who feels like you’re good at thinking, it can make you think that the space doctor’s numbers must be wrong. But a lot of the time it’s not you or the numbers—instead, it’s the picture that’s wrong in some small way.