Below please find links to popular channels on youtube. Thanks to my step-daughter for these links.
Specifically Science Channels:

Sci Show
http://www.youtube.com/user/scishow/videos
ASAP Science
http://www.youtube.com/user/AsapSCIENCE/videos
Fun Science
http://www.youtube.com/playlist?list=PLEB92E275F78C7301
The Brain Scoop
http://www.youtube.com/user/thebrainscoop


Educational Channels Wherein You Can Find Science Content:

Crash Course
http://www.youtube.com/user/crashcourse
C. G. P. Grey
http://www.youtube.com/user/CGPGrey/videos
V Sauce
http://www.youtube.com/user/Vsauce/videos

Mark Heilbrunn
Prep Academy for Writers
Queens, NY