You can use the app on its own. But the experience is even better with a special virtual reality viewer. Thanks to a partnership with Google, we will be sending free Google Cardboard VR viewers to all domestic New York Times home delivery subscribers who receive the Sunday edition. You should receive your Google Cardboard with your Sunday newspaper by November 8, 2015.

Times Insider subscribers who have chosen to receive marketing emails will also receive promotional codes via email that can be redeemed for free Cardboard viewers.

You can also buy a Cardboard viewer here.

The stories

War has driven 30 million children from their homes. These are the stories of three of them. (To see the virtual-reality films, download the NYT VR app using one of the links above.)

The Displaced: Introduction

Nearly 60 million people are currently displaced from their homes.

Lebanon: Hana’s Story

At 12, she has lived one-quarter of her life in a debilitating state of suspension.

South Sudan: Chuol’s Story