Why it pays to be grumpy and bad tempered.

 Pop psychology. Nothing there my grandmother couldn't have told me. 

lol, I saw that one coming but was too lazy to avoid it.  I'm going to say, in a sense yes. Pop psychology is mostly built on common basic truths. For example, keeping a gratitude journal (write 3 things you are grateful for every morning) to increase happiness was big a couple of years ago. Being grateful for what you have in life isn't a new concept. 

From the article:

Over the course of the study, 20% experienced a major cardiac event and 9% percent died. Initially it looked like both anger and suppressed anger increased the likelihood of having a heart attack. But after controlling for other factors, the researchers realised anger had no impact – while suppressing it increased the chances of having a heart attack by nearly three-fold.

I'm pretty sure not getting angry to begin with is the healthiest option. I would also like to know how they measured whether or not people were getting angry and whether or not they supressed it. 

In the game, the first player is given some money and asked how they’d like to divide it between themselves and another player. Then the second player gets to decide whether or not to accept. If they agree, the money is split how the first player proposed. If not, neither player gets any money.

The ultimatum game is often used as a test of our sense of fairness by showing whether you expect to get a 50-50 share or whether you are happy for each person to be in it for themselves. Interestingly, all negative emotions led to more rejections by the second player, which might suggest that these feelings enhance our sense of fairness and the need for everyone to be treated equally.

Seems more like negative emotions cause people to cut of their nose to spite their face. They get nothing in their zeal for fairness. Life is very often not fair. 

The entire article is full of suppositions and assumptions; conclusions drawn on inadequate information.