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    Start TODAY members finish February's balance-themed challenge

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  • Modern medicine roundup: The Atlantic diet, scent therapy, more

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  • Schools suggest mildly sick kids should attend class anyway

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Loneliness can be hazardous to your health, experts warn

05:34

Many Americans say they’re socially isolated, and experts warn that that not only leads to emotional stress – it can even be life-threatening. NBC senior national correspondent Kate Snow reports for TODAY.