Has your grandpa told you that he can predict the weather better than the reporters? There is a group of scientists in the UK that is studying this. They have about 9000 participants testing out their app, "cloudy with a chance of pain." The app uses weather ratings on a GPS and pairs the data with your pain level.
http://www.cnn.com/2016/09/19/health/weather-pain-link/index.html
Interesting. I'll be paying attention to see if my knees hurt more now that the weather is getting cooler. :)
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