How old is your tail-wagging bundle of joy in human years? According to the well-known ''rule of paw,'' one dog year is the equivalent of 7 years. Now scientists say it's wrong. Dogs are much older than we think, and researchers devised a more accurate formula to calculate a dog's age based on the chemical changes in the DNA as organisms grow old.http://feeds.feedburner.com/~r/sciencedaily/plants_animals/dogs/~4/UpW38Ctm1Xw

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