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Giving thanks isn't just a holiday tradition. It's an important part of being human. Science says the feeling of gratitude probably showed up early in our evolution. Young kids and even some chimps show that they want to return favors to those who help them out. Researchers believe gratitude probably helped early humans work together and survive as social animals.

Amrisha vaishJenae nelsonMalini suchakMichael tomaselloSarah schnitkerUniversity of virginiaEducational media groupHoward hughes medical institute scienceCanisius universityDuke universityScience departmentBaylor universityAssociated press healthHoward hughes medical instituteEducational media