Your knees have worked just as hard as you have your entire life. That means your joints have experienced a natural decline in cartilage and lubrication. When you pair that with the age-related loss ...

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Courtney Southwick is a writer focusing on health, nutrition, and disease. She has been blogging for the past two years at CourtneySouthwick.com. She writes blogs and articles for online publications ...

Daniel is Lifehacker's Shopping Editor covering tech deals and reviewing TVs, headphones, speakers, and projectors. He earned his master’s in journalism from Columbia University and has reported for ...