Patrick Doheny/Flickr

A positive relaxed attitude may not be the key to long life.

A new book, The Longevity Project, publishes the findings of a nearly century-long study begun in 1921 by a Stanford psychologist that looked at the life choices and health records of 1,500 individuals to see what caused certain individuals to live past their 70s and what led to early disease and death in some. UC Riverside psychology professor Howard Friedman analyzed the results and co-authored the book. He shares some surprising findings about what leads to long life.