I took some video while I was writing Amazing Cardboard Tube Science. This shows one the projects--a marble run. Marble runs are great for discussing potential energy, kinetic energy, and energy transformations. https://youtu.be/rwhGntSfK28 And here you can see some of the engineering challenges I had to overcome as I worked: https://youtu.be/6T2CKH_64kA Now, a challenge for … Continue reading Marble Run