#$&* course PHY 201 4/18 about 3:30 pm I completed the PHeT 9.22 in assignment 20. I did not know if I needed to submit anything for this or not. I actually got my kids to help me balance things on the ""see-saw"". My oldest daughter got the hang of it pretty good counting the lines measuring the distance along the plank. ???I notice that there are a few more PHeT assignments with nothing listed to submit in future assignments, do I need to submit anything to say that I have completed them???