We often assume that small acts of kindness are just that small. But the study, “A Little Good Goes an Unexpectedly Long Way: Underestimating the Positive Impact of Kindness on Recipients,” found that people who do something kind often underestimate just how much it means to the person receiving it.A cup of coffee, a helping hand, or a few thoughtful words may feel insignificant to the giver, but to someone having a difficult day, they can mean far more.The people in these 14 stories probably thought they were simply being nice and moving on. What they didn’t know was just how deeply their kindness would stay with someone else.