What are the most popular religions in cities around the world?

For this week's City Index, we take a look at the most dominant religions in ten cities around the world.
Which holidays are celebrated in cities around the world?

Tomorrow is Thanksgiving Day, a uniquely American holiday. What holidays do people in other cities around the world celebrate? Hopes&Fears found out.
What do kids learn by age 10 in cities around the world?

This week we broke down—as specifically as possible—the skills and teachings children must master by the time they reach the age of 10 in several cities from across the globe.