A new technology promises safer and easier logins to websites and apps. But using them raises a lot of questions.

At a recent demo, the company’s director of product management for Fitbit and health Andy Abramson showed us how his app surfaced his weekly cardio load in a ring, with bars to its right for his ...

How to clear cached data from Android apps What you'll need: Any Android device. The exact steps may vary slightly by manufacturer, but the general process remains the same.