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　⇒The Press Association: Genes 'influence our happiness'

Happiness levels throughout life are strongly influenced by the genes people were born with, researchers have said.
　
A University of Edinburgh-led study of 900 pairs of twins found a person's genetic makeup was around 50% responsible for how content they were.
　
The other 50% was linked to external factors, such as relationships, health and careers.
　
The Edinburgh researchers worked with academics at the Queensland Institute for Medical Research in Australia.