A SOLAR PANEL ON A ROBOCAR: “I often see people say they would like to see solar panels on electric cars, inspired by the solar-electric cars in the challenge races, and by the idea that the solar panel will provide some recharging for the car while it is running and without need to plug it in. It turns out this isn’t a tremendously good idea for a variety of reasons. . . . People really are in love with the idea of a solar powered car. It’s not really possible to go green this way right now, but the future might bring something interesting.”