In a culture where we often glorify being “busy,” pay more attention to our phones than friends, and celebrate retail therapy, it’s no wonder Marie Kondo’s bestselling book and binge-able. Netflix show about sparking joy to reduce clutter continue to be skyrocketing successes. We’re collectively clamoring for more joy, and here’s the good news: It can be simple to cultivate. The even better news: It’s contagious. In a Harvard University study, researchers discovered what they dubbed the “Mother Teresa Effect”: Simply witnessing acts of kindness (such as those performed by Mother Teresa) may have a positive physiological response, even potentially improving immune function. Who knew kindness could be such a fulfilling spectator sport?