Kio Stark has made a career of talking to strangers. She made it her task to try to understand why she does that, in this TED talk. She has decided that it is better to use one’s perceptions than to use categories, such as the category of “stranger.” Using this category means that we are not treating others as fully human. There are other benefits. Some studies show that people are more comfortable opening up to strangers than to people they believe they know. We expect that people we know understand us–we expect them to read our minds. Not so with strangers, with whom we start from scratch. Sometimes they do understand us better. Maybe we need strangers, but how should we interact with them, how do we balance both civility and privacy, which are the guiding rules in the U.S. In other countries there are other rules. In Denmark, many folks are extremely adverse to talking to strangers.

Stark offers an exercise that involves smiling, and then “triangulation,” commenting on a third person or a thing. Or engage in “noticing,” such as complimenting the other person on something (and you can most easily talk to a stranger’s dog or baby). Or engage in “disclosure,” sharing a personal experience, and this tends to cause the “stranger” to reciprocate.

Stark’s main message is that we need to stop being so wary of strangers and to make a place for them in our lives.

At The Atlantic, James Hamblin follows up with his own explorations on talking to strangers.