Why it pays to be grumpy and bad-tempered

Being bad-tempered and pessimistic helps you to earn more, live longer and enjoy a healthier marriage. It’s almost enough to put a smile on the dourest of faces.
Read more: http://www.bbc.com/future/story/20160809-why-it-pays-to-be-grumpy-and-bad-tempered?source=Snapzu