First there were calculators, followed by calculators that came with a solar panel somewhere on the front segment right below the display, where you no longer need to rely fully on batteries to keep those number crunching moments going – only during the daytime, of course. Well, now the humble solar calculator has entered into its next iteration, known as the Solar Power Electronic Calculator Blue with 4 Port USB 2.0 Hub. Guess getting juiced up from the sun isn’t enough that it has to boast a 4-port USB 2.0 hub to feel adequate with the rest of its gadget brethren. Compatible with Windows-based systems only (Windows 2000 and above), the Solar Power Electronic Calculator Blue with 4 Port USB 2.0 Hub will retail for $12.69 each when purchased in bulk.