Just a Reminder (and because I haven't seen this video before)

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Ana attempted to make a second robot, this time on her own. We ended up having to pull it apart because she had several screws left over. I had to explain that those weren't "extras," and showed her where she'd left them off in the instructions. It meant pulling almost everything apart again, as I said might happen if she didn't pay attention, but ... all part of the learning process. The only problem after everything was finished is the same problem we've had with the frog. The motor runs, the cogs turn, but the robots don't move. Or they jiggle around a bit, but they don't move. There's no propulsion. Anyone know how to overclock a robot kit?