COLD WATER SWIMMING? A few days ago I received the latest issue of Scientific American and read an article which claimed that cold water swimming is surging in popularity.  And today, I found a couple more accounts in which cold water swimming adherents maintain it can act as an anti-depressant and might help forestall dementia. Okay, that grabbed my interest—I’m ready to try almost anything that might work against dementia! Even though I usually wear a wet suit, I can’t say I ever got a kick out of cold water swimming. When I was a bit younger and entered triathlons...