div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=scihappiness-happify-28309-gruber-j-kogan-a-et-al-2013-happiness-is-besthtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: SciHappiness Happify 28309Gruber J Kogan A et al 2013 Happiness is best kept stable: positive emotion variability is associated with poorer psychological health Emotion The loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220502135f5f46410d398b51ee08d7ffhtml5thumbnails1jpg width=140 height=200 divdiv