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How to be Sad: The Key to a Happier Life is written by Helen Russell and published by HarperCollins UK. It's available with International Standard Book Number or ISBN identification 0008384576 (ISBN 10) and 9780008384579 (ISBN 13).
‘In any human life there are going to be periods of unhappiness. Learning how to be sad is a natural first step in how to be happier’ Meik Wiking, CEO of the Happiness Research Institute