The very act of observing something changes it.
Brandon Stanton, the 30-year-old photographer behind the Humans of New York blog, experiences this daily. The formula is simple: he walks up to strangers, takes their portraits, asks a few questions and documents the interaction.
"I don't pretend to be showing the whole person," Stanton says. "What I want to do is give people a small window into the lives of these people that they might pass by every single day and not even think twice about."
Since August, Humans of New York has gone global. The United Nations is sponsoring Stanton's world tour to promote its Millenium Development goals.
"We're trying to go to a variety of different places and just listen to people around the world, and hear their stories as they tell them," Stanton says.
So far those places have ranged from a shopping mall in Erbil, Iraq to a refugee camp in Jordan... a bar in Kampala, Uganda to a sidewalk in Kiev, Ukraine.
News Stream caught up with Stanton while he was in New Delhi, India. Hear about some of the most powerful experiences from his trip in the video above.