In a study, patients with Parkinson's disease, a progressive nervous-system disorder, had fewer falls after taking up Tai Chi. iStockphoto hide caption

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Plan B is available over the counter for people 17 and older. AP hide caption

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A Kansas City family prepares a meal together. A new study finds that working mothers log more hours — and get more stressed — than working fathers while multitasking at home. (This family wasn't part of the research.) Allison Long/MCT /Landov hide caption

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One recent study found that people were able to burn up an extra 450 calories a day with one hour of moderate exercise. That can include walking briskly, biking or swimming.

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