Adults smileless than children do in a day.386times less,in fact.As a result,weare becoming more and moreunhappy and u_______(76).Allhuman beings areb_______(77)knowing how tosmile.Children are s_______(78)tosmile up to 400 times a day.Forthem,a smile comes from theirh_______(79) and pleasure.Unluckily,as we growo_______(80),we smile less andless.“Adults only smile 14 timesa day,”says Jamb,a researcher.That means they only smile