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I thoroughly enjoyed Joyce's introduction to some topics with energy, electricity, and circuits at an introductory level; especially without trying to throw a lot of technical terms at us.  As a electrical engineer, I appreciate a great presentation on anything like this.  I also appreciated how Joyce tried to draw out our understanding of our observations and led us to subtle discoveries.  There was an amazing amount of information in the lesson that was barely touched on.  As a teacher, there is the fine balancing act of exposing students at their readiness and this lesson was wonderfully executed at helping us start to think about electricity in simple lay terms.  At higher grade levels I can imagine introducing accurate terminology and relationships between what we observe, predict, and can measure.  I also like the hands-on of any kind with science and pure-science.  Manipulatives (even if virtual) give all of us some time to play, explore, discover, reinforce and socailize over the new material.  Thanks.