You encounter someone collapsed on the sidewalk and quickly dial 911. Whether or not the operator instructs you on how to deliver cardiopulmonary resuscitation could mean life or death, especially ...

He and another bystander put her flat on her back and checked ... potential cardiac arrests within roughly a quarter-mile when calls come into a community’s emergency response dispatch service.

“We call it a bystander effect. There are some psychological and social factors behind this bystander effect. The first thing is the diffusion of responsibility, when many people are present so ...