Perhaps the big question isn't how to be happy, but where to be happy. An entire country probably can't be entirely happy, but some countries are happier than others.
There is evidence that those who have happier lives are likely to live longer, be more trusting, be more cooperative, and be generally better able to meet life's demands, according to the World Happiness Report 2018, an annual publication of the United Nations Sustainable Development Solutions Network.
The survey of the state of global happiness ranks 156 countries by their happiness levels, asking people to rate their lives on a scale of zero to 10, where the worst is zero and the best 10.
Factors considered in the report to contribute to happiness include: the GDP per capita, social support, life expectancy, freedom to make life choices, generosity, and perceptions of corruption.
Each country is compared against a hypothetical nation called Dystopia, which represents the lowest national averages for each key variable. Think Margaret Atwood's "The Handmaid's Tale" or Aldous Huxley's "Brave New World."
Out the 156 countries surveyed in the report, these are the happiest. And in case you're wondering, the U.S. comes in at No. 18.
Above, a family has a picnic outdoors in Rotorua, New Zealand, the eighth happiest country.
All the top countries tend to have high values for all six of the key variables that have been found to support well-being: income, healthy life expectancy, social support, freedom, trust and generosity. Finland is also the happiest country for immigrants, the report says.
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Above, a man and woman wear traditional Norwegian costumes.
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Pictured is Sandavagur village on Denmark's Faroe Islands.
Above, people bathe in the hot waters of a geothermal bath resort on the Reykjanes Peninsula in Iceland.
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Pictured is a viewpoint along the Eiger trail and the 13,015-foot Eiger mountain in the Bernese Alps of Switzerland.
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Royal Canadian Mounted Police ride in a Saint Patrick's Day Parade in Ottawa, Canada.
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8. New Zealand
A farmer and his dog in the remote West Coast of New Zealand.
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Midsummer is celebrated with dancing around the maypole in Sweden.
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Above, people float in the waters of the Dead Sea in Israel.
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Pictured is a Christmas market in Vienna.
13. Costa Rica
A sloth in a rescue center in San Jose, Costa Rica.
Ireland President Michael D. Higgins throws a pitch for the Liam Miller Tribute at a stadium in Cork, Ireland.
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Pictured is Hamburg, Germany.
A cyclist in rides in the countryside in Flanders, Belgium.
18. United States
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19. United Kingdom
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20. United Arab Emirates
Above, the UAE National Day celebration parade in downtown Dubai in 2015.
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21. Czech Republic
A girl wears a traditional costume during The Ride of the Kings, which takes place in spring in four Czech towns as a part of the Pentecost traditions.
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Above, fans turn out to watch France's World Cup win in 2018.
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Above, children play in in San Miguel de Allende, Mexico.
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Pictured is Torres del Paine National Park in Patagonia.
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Boys fly kites on All Saints Day in Santiago Sacatepequez, Guatemala .
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