learninreturn | Robotics
Learninreturn offers nice lessons relating to real science and engineering projects. I know as a hs student, the most memorable work I did was a simple term paper on what here in the boondocks seemed science fiction, stuff that was actually out of the labs and into the field.
The interactive and assessment part runs more in the worksheet vein, though it is online. Still, cool content...if it inspires to do the hard work of science discipline and math.