Everyone, I'll be at the museum most Wednesdays from now on, in addition to many weekends. This is due to a (positive!) change in my work. I went today and it was busy. Steady stream of families all afternoon. Most of them took full tours, asked good questions, and had children who were smart + well-behaved. Jeff B. stopped by to work on something and at one point he took a tour group around because I was busy with another family. After public hours ended, I fixed the Lego robot. It had two problems -- 1. the top forklift sensor was being flaky and saturating it in alcohol hadn't helped, so I replaced it; 2. One set of treads kept failing to move, which I thought meant performing robot surgery :) to replace that side's motor, but I figured out that what actually happened was a drive gear had slipped to the side and wasn't sufficiently contacting its pinion -- so I moved it back into place and inserted a spacer that will prevent it from sliding again, and did the same on the opposite side as preventative maintenance. Robot fixed!