Videos and Lectures
- [1] KhanAcademy.org
- [2] TED.com
- [3] UnplugTheTV.com
Learn New Things
Testing Knowledge
- [6] FreeRice.com
- [7] LizardPoint.com
- [8] MathRun.net
Teach Yourself Something
- [9] OpenCulture.com
- [10] NoExcuseList.com
Youtube Channels
- [11] SciShow
- [12] CrashCourse
- [13] MinutePhysics
- [14] TEDEducation
EDIT:
Subreddits
- [15] r/DepthHub
- [16] r/explainlikeimfive
- [17] r/RedditGuides
- [18] r/TrueReddit
http://www.reddit.co...ly_stimulating/