"take" and "bring"

I can't believe that so many native-English speakers don't know how to properly use the words "take" and "bring." But, I'll admit that, even though I know how to use the two, I also find that the difference is hard to explain: I had a Spanish teacher in high school, Ms. Hayden (from Chile), who asked me to explain the use of those two words. I didn't know how to do it. Do you?