Further vs. Farther, which to use?

When should you use further vs. farther? A couple of examples should help:

If you are talking about distance, then use farther as in:
We are not there yet; we still have farther to go.

Further is more for an idea, as in:
And furthermore….

For more info check out the Grammar Girl’s page at
http://grammar.quickanddirtytips.com/further-versus-farther.aspx

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