The app stores are filled with what are called "vault apps" or "locker apps," and they're specifically designed to look like ...

But enter a secret passcode on that screen, and a hidden vault appears. Inside, users can store photos, videos, messages, ...

On phones, Google’s earthquake alert system uses built-in sensors, such as the accelerometer, to detect tremors. The device then sends anonymized data to Google's servers. When multiple phones in the ...