In the 1970s, when I lived in Halifax, Nova Scotia, I sailed as mate on a traditional 50-foot wooden schooner, leaving early one summer day from the Bras d’Or lakes, near where Alexander Graham Bell tested his airplane, the Silver Dart. By evening, the ragged northern end of Cape Breton had disappeared over my starboard shoulder. Alone at the wheel, listening to the creaking, splashing, sighing sounds of sailing, I heard dolphins whistle, and when dawn came, I saw the sun rise on southern Newfoundland’s wall of cliffs that fall hundreds of feet into the sea. My skipper’s navigation was excellent: dead ahead was the flashing light of the navigation buoy we needed to guide us to a gap in the cliffs, less than a quarter mile wide.