Mr. Settle's YouTube
Youtube Tutorials, labs, make-up work, etc... all in one place.
Kahn Academy (Physics)
YouTube tutorial in Physics
Kahn Academy (Chemistry)
YouTube tutorials in Chemistry
Veritassium YouTube Channel:
Great YouTube Channel for explaining cool science phenomenon. Very much worth exploring.
Some other YouTube Screencasters that do a GREAT job of CLARIFYING SCIENCE CONCEPTS
http://www.youtube.com/feed/UCEik-U3T6u6JA0XiHLbNbOw (Bozmen - Teacher
http://www.youtube.com/feed/UCs3uxTPY376NA7H34bPhRtQ (Robert Becker - Teacher of the Year and awesome tutorials)
http://www.youtube.com/feed/UCs3uxTPY376NA7H34bPhRtQ (Robert Becker - Teacher of the Year and awesome tutorials)