Is it possible to live your life without harm to others?

You may have heard the Wiccan Rede, which includes the sweeping charge, “Do as you will, but harm ye none.” The idea is that we are free to do anything we want as long as it does not cause harm to others. This is similar to the Golden Rule, “Do unto others as you would have them do unto you,” and Bill and Ted’s advice to “Be excellent to each other.” Almost every religion and philosophy has some variation on this theme. However, though it may sound cynical, I am not sure it is even possible to avoid harming others. Short of living alone atop a mountain, how could anyone truly follow these deceptively simple sounding rules? Would living alone atop a mountain even be enough?