Here's an update to my first science post, this time, all youtube channels.
Vihart is a professional mathemusician at the Khan Academy and makes awesome math videos including an ode to the number 2.
Deep Sky Videos by Brady Haran explore telescopes, nebula, and other awesome outer space things.
Numberphile also by Brady Haran are videos all about numbers including card tricks and the Batman Equation.
Periodic Videos is all about chemistry. There's awesome explosions/ reactions, science news and other molecule-y stuff. (Also check out the host's Einstein-ian 'do!)
Sixty Symbols has videos about physics and astronomy including the Large Hadron Collider.
SciShow, the cousin to CrashCourse, has science news and things like the Official Government Statement on Mermaids.