There's a reason the Grinch's heart grew three sizes the day he returned all the gifts to the Whos in Whoville.
Happify, a site that specializes in uncovering the science of happiness, examined the science of giving, and why people feel better after doing it. They compiled their findings in the graphic below, which shows that there's a lot of fuzzy feelings to gain from shopping for others -- even down to the kind of gift you choose to get.
Just in time for the holidays.
Cover image: Tumblr.