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In one fascinating study, researchers divided a set of participants (who wanted a coffee) into two groups: one group was instructed to have an interaction with the barista, and the other to be as efficient as possible. Like the “strangers on a train” study that we mentioned in Chapter Two, the researchers found that people who smiled, made eye contact, and had a social interaction with the barista—in this case, a complete stranger—came away feeling better, and with a greater sense of belonging, than those who were instructed to be as efficient as possible. In short, having a friendly moment with a stranger was uplifting.

Small moments can provide an uplift for our mood and they can help balance out some of the stress we feel. An annoying commute can be softened by a short conversation with the security guard at work. A sense of disconnection can be alleviated when we say hello to our mail carrier. These kinds of minute interactions can affect our mood and energy throughout the day. If we get in the habit of seeking out and noticing opportunities for these daily uplifts, over time they can have far-reaching effects. Not only for us, but for our social networks as a whole; repeated casual contact has been shown to foster the formation of closer friendships. And sometimes even the most casual contact can open us up to whole new realms of experience.