If you follow national and international news it’s important to make sure you remember that other people in other places may define THINGS differently from the way we define them in America.
For example: Did you know that a U.S. Billion is different from a British Billion? (See also the Oxford Dictionaries website entry.)
(Think about those $$$ amounts thrown out in news stories about international financial debacles. Whose “Billion” is being referenced?)
Always question assumptions.