Symmetry factor

We decided to move into the 21st century. Well, technically, we are there already, since we have not one, but two robots roaming the open spaces of our house. What I’m talking about are the two robots that perform two functions that humans need to perform from time to time in order to keep their habitat clean, floor-vacuuming and floor-washing. So we got Roomba and Scooba. The later is especially helpful with tile floors… Here it is:

 It actually works… That is, it still works… until I get this book and start experimenting with it… By the way, if you are thinking about getting one, buying one in the Sharper Image store is the last thing I’d do (they’d overcharge you by a factor of 2)…. just my two cents…