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"Science4Us is a standards-based digital science curriculum that teaches science using the 5E inquiry-based instructional model. In addition to over 350 digital games and online activities, there are tons of offline experiments and hands-on projects to keep students engaged and excited about science.  It's a great choice for teachers looking to include cross-curricular activities that connect science instruction to math and language arts. Students will also learn the importance of notetaking and observing, with their very own digital notebook."

"It is a common view that "if only someone could break this down and explain it clearly enough, more students would understand." Khan Academy is a great example of this approach with its clear, concise videos on science. However it is debatable whether they really work. Research has shown that these types of videos may be positively received by students. They feel like they are learning and become more confident in their answers, but tests reveal they haven't learned anything. The apparent reason for the discrepancy is misconceptions. Students have existing ideas about scientific phenomena before viewing a video. If the video presents scientific concepts in a clear, well illustrated way, students believe they are learning but they do not engage with the media on a deep enough level to realize that what was is presented differs from their prior knowledge. There is hope, however. Presenting students' common misconceptions in a video alongside the scientific concepts has been shown to increase learning by increasing the amount of mental effort students expend while watching it."

Australian site that seems to deal with robotics indepth.