It's just 19 characters (22 if you count the spaces) in all-caps Helvetica, painted Highway Yellow against an industrial green girder. Yet, somehow, the "Welcome to Cape Breton" sign on the Canso Causeway swing bridge maintains a deep iconic grip on Cape Bretoners. Just this morning, it showed up in my Facebook feed when Megan MacDonald, a CB ex-pat home from Toronto for a few days' R&R, re-posted this meme from the "Meanwhile in Cape Breton" group:     Years ago, riding a bus from Halifax to Cape Breton, I compared notes with the woman in the next seat about the point in the journey when it finally...