Sign Out from Android Hangouts

Sign out of Hangouts

1. On your Android device, open the Hangouts app .
2. Touch your profile photo.
3. Touch Settings.
4. Touch your Google Account.
5. Scroll to the bottom and touch Sign out.

Source: https://support.google.com/hangouts/answer/3118600?hl=en

How to Install and Build OpenCV on OSX

source: http://blogs.wcode.org/2014/10/howto-install-build-and-use-opencv-macosx-10-10/