If you've ever noticed that your joints, muscles, or old injuries start talking to you as New York shifts into its humid summer mode, you're not imagining it. There's real physiology behind weather-related pain, and there's a lot that can be done about it before the worst of the summer heat and humidity arrives. This is the time of year I start having this conversation with patients — because how you feel in July and August often depends on what you do in May and June. Why Hu