Zac Wheeler posted to the DPRG mailing list, "I've finished (sort of) building my first sumo bot, which I believe is also the first pico sumo robot, as well as the current smallest robot in the world. I'm defining robot here as self-powered, autonomous, with active sensing of its environment and the ability to control its movement. It has a battery, intelligent control, infrared sensors, and two motors." This brought to mind the very first story we posted here at robots.net back in 2001, about Sandia's tiny robot. I mentioned this to Zak and he said, "The Sandia bot is the one that inspired me to take this on ... their bot is a quarter of a cubic inch - about twice the volume of mine. Check it out on the nickel vs. mine on the dime."