Large groups of unruly teenagers at an Illinois pool and California mall prompted early closures that resulted in arrests, highlighting what experts call a symptom of cultural breakdown.

In a bold wake-up call to parents everywhere, the team behind the acclaimed Screenagers documentaries and the "Away for the ...

It’s coordinated by Improv Everywhere, a global flash mob. New York participants were assigned personal numbers for central gathering spots in each city borough.

All flash mobs can be measured against the original mob, organized in 2003 by Harper’s senior editor Bill Wasik. Under his guidance, more than 100 people gathered at a New York Macy’s and ...