Is pessimism pointless? Britons are known worldwide for being miserable. But some say you need a sunny outlook on life to make things better.
Gloom kills. Time to cheer up, formula proves

Glossary
Yemen - The poorest country in the Gulf region is in the midst of a humanitarian crisis.
Poverty - The state of being very poor.
Birmingham - A major city in England. It has a population of more than one million.
Miserable - Sad.
Survey - When you ask a group of people questions about what they think about a particular topic.
Relish - Enjoy greatly. Or a type of sauce!
Formula - A formula is a group of mathematical symbols and numbers that show how to work something out.
Pessimism - Always expecting the worst.
Optimism - Having a hopeful and positive outlook.
Economy - The way that money flows through a country, which affects wages and the cost of living.
Climate - The weather over a long period of time.