Check out this series of interactive learning tools that were created to accompany "Prentice Hall's middle grades science program". Apparently, close to a 100 were developed, so this is just a sample which includes things like the solar system and seismic waves. My favourite, though, is the catapult simulator, which taught me everything I needed to know about medieval trajectories.
This kind of makes me wish I was back in elementary school again. In my day, all we had for "interactive learning" was a sharpened stick and a potato.