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Volunteers who used money to save themselves time were more content than volunteers who purchased themselves physical stuff. Karen Hopkin reports.
Learn more about your ad choices. Visit megaphone.fm/adchoices
By Scientific American4.2
599599 ratings
Volunteers who used money to save themselves time were more content than volunteers who purchased themselves physical stuff. Karen Hopkin reports.
Learn more about your ad choices. Visit megaphone.fm/adchoices

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