As seen on BigSpeak.com

One of our favorite talks is by Derek Sivers. In his short comic presentation, he shows by traveling across the world you can find the opposite of what you believe can also be true. For example, in the U.S and Europe, we have names for streets but not for our city blocks. But in Japan, they name their city blocks and have no names for their streets. Or in China, you pay a doctor when you are well because he or she is doing a good job, but not when you are sick.

So questions your assumptions about how systems work. The opposite might just be as true.