Ben Sidran

“Thus, when someone smiles at us, we are likely to smile in response, which in turn makes us feel a little more positively about them and our circumstances in general. In this manner, laughter will tend to prompt laughter, anger will prompt anger, and tears will prompt tears. From an evolutionary standpoint, the emotional contagion is an important trait. It’s what allows a mother to comfort a child so effectively. It’s also what allows us to immediately adjust our demeanor when suddenly encountering friend or foe in the wild.”
― Amor Towles, Table for Two