-Ad-
Instead of nonsense browsing (like here on xpt.de) you should do something more meaty in front of your screen. Check these out:
Videos and Lectures
-Ad-
- KhanAcademy.org  |   TED.com  |   UnplugTheTV.com
Learn New Things
- FuckingHomepage.com  |   IfEveryoneKnew.com
Study At A University
-Ad-
Testing Knowledge
- FreeRice.com  |   LizardPoint.com  |   MathRun.net
Teach Yourself Something
- OpenCulture.com  |   NoExcuseList.com
Youtube Channels
- SciShow  |   CrashCourse  |   MinutePhysics  |   TEDEducation
-Ad-