Why Is It So Hard to Let Go of Grudges?

From SciShow Psych.

We all have some displeasing memories from the past that still make our blood boil. Why are those grudges so hard to let go of?

Hosted by: Anthony Brown
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Image Sources:
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https://www.istockphoto.com/photo/i-need-to-find-a-way-to-cope-with-this-stress-gm1164339481-320018725
https://www.istockphoto.com/photo/senior-man-using-laptop-outdoors-is-confused-and-frustrated-gm1163695995-319619609
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