An app is one woman's idea to make the streets of New York safer. She was the victim of a violent attack, and now she wants to make sure no one ever has to walk alone if they don't feel safe.

After moving to New York City, I decided to walk every block of Manhattan. It took me 13 months and I learned so much history ...

Pamela Garber develops the "Never Walk Alone" app to provide New Yorkers with companions for safer city walks.

People who regularly walked at a brisk pace had lower risk of irregular heartbeat than people who walked leisurely.