A study of nearly 1000 pairs of identical and non-identical twins found genes control half the personality traits that make people happy while factors such as relationships, health and careers are responsible for the rest of our well-being.

• 一项对近千对同卵及异卵双胞胎开展的研究发现，在快乐的性格特征中，有一半是由基因控制的，而另一部分则受到人际关系、健康、职业等因素的影响。