@LG --
It's because you simply haven't taken all of the variables into account and are working from a painfully, and purposefully, limited set of data. The same approach will work when you stop deliberately limiting what you think the method can do.
well why does one particular approach fail dismally with the president (even though it works wonderfully for things like molecules and planets ... at least to a degree but thats a bit more involved)?
It's because you simply haven't taken all of the variables into account and are working from a painfully, and purposefully, limited set of data. The same approach will work when you stop deliberately limiting what you think the method can do.