It certainly seems that we're going about our lives, that what we're doing, who we're with, what we're thinking about, have a big influence on our happiness, and yet these are the very factors that have been very difficult, in fact almost impossible, for scientists to study.
Изглежда, че това, което преживяваме, това, което правим, с кого сме, за какво мислим, влияят на щастието ни, и все пак, това са факторите, които са много трудни, ако не и почти невъзможни за научно изследване.