english: In fact, in the last few years, there's been an explosion in research on happiness. For example, we've learned a lot about its demographics, how things like income and education, gender and marriage relate to it.
non_english: Zapravo, u poslednjih nekoliko godina došlo je do ekspanzije u istraživanju o sreći. Na primer, mnogo smo naučili o njenog demografiji, kako neke stvari kao što su primanja i obrazovanje, pol i brak imaju veze s njom.