Another time vs. quantity distinction, these two beasties trip up the best of us. While you work to further your career, you may have to travel farther to find what you need. You may throw your mouse farther than you did last time, but it still didn’t get you any further in your copy.

Farther - refers to physical distance.

Further -refers to time, quantity, or degree.

The farther you write, the further you will go in your journeys. But, be nice to your mouse.