The drop in serious crimes in Lancaster, Calif., from 2010 to 2011, which the mayor partly attributes to the sounds of chirping birds that play over 70 speakers along a half mile stretch of the city five hours a day.
Join the Discussion
After you comment, click Post. You can enter an anonymous Display Name or connect to a social profile.
More from News in Numbers
Didn't find what you were looking for? Search our archives, or subscribe to one of our e-newsletters, and we'll bring the news to you!