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.
Svakako se čini da ono s čime se susrećemo u životu, ono što radimo, s kime smo i o čemu razmišljamo ima velik utjecaj na našu sreću, a opet to su sve faktori koje je znanstvenicima vrlo teško, zapravo gotovo nemoguće proučiti.