Dick Van Dyke sits down with TODAY’s Al Roker and opens up about the life lessons he hopes readers will take away from his new book, "100 Rules for Living to 100: An Optimist's Guide to a Happy Life.” He discusses choosing joy, how easy it is to take the right attitude in life and to "look for the best of everything, look what's positive and the people that are positive." He also looks back on some of his most iconic roles, saying "I got to do for a living what I would've done for nothing."

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