Până nu de mult, era un concept filozofic dar în ultimul timp, fericirea a început să intereseze pe tot mai mulţi cercetători. Unii au spus că fericirea e poezie pură, alţii că e matematică.
Peter Dodds şi Chris Danforth de la Universitatea din Vermont, au creat o metodă prin care pot determina cu o precizie matematică gradul de fericire a individului în raport cu fericirea globală. Conform celor doi cercetători, cea mai fericită zi a americanilor din ultimii 4 ani a fost numirea lui Obama ca şef al statului. La polul opus se situează vestea morţii lui Michael Jackson ca fiind cea mai tristă zi a umanităţii din ultima perioadă.
Instrumentele de măsurare sunt blogurile, conversaţiile pe Twitter şi Facebook ori cuvinte de pe diferite forumuri.
Pentru elaborarea acestui studiu au fost analizate peste 2,3 milioane de mesaje on-line.
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