New Google prompt vastly simplifies two-factor authentication

Two-factor authentication is getting a stronger padlock to further secure your Google account. Currently you can further secure your account by getting a code via text message (or phone call), or with a code from the Google Authenticator app.

A new Google prompt adds a third option....
http://www.macworld.com/article/3086346/android/new-google-prompt-vastly-simplifies-two-factor-authentication.html#jump