"Big cities have bustling corridors where saying “hello” would be out of place. But there are plenty of places, even within the most densely packed city, which lend themselves to neighborly acknowledgement: an apartment building, an office, a quieter residential street. After all, the feeling of connectedness is one of the benefits of living in a city. Let’s make sure to utilize it. It’s good for us."
Why You Should Say ‘Hello' to Strangers on the Street