Just as broadcast radio was turning one hundred, Casio was selling its one billionth calculator, as the company reportedly announced that this past December held the milestone purchase. The firm's first electronic calculator, dubbed the 001, hit the market in 1965, and played a big part in the development of the chip industry by generating demand for LSI chips. The pocket-sized renditions the company is so well known for started in 1972 with the Casio Mini, only to be followed by the graphing scientific version in 1985. These monochrome graphing editions will always hold a special spot in our hearts, as there was just nothing like kicking back during class and crushing your previous Tetris record while the instructor gave you kudos for focusing so intently on your work, and of course, that wasn't the only game to ever get ported to the small screen. So here's to Casio for hitting the big 1 billion, but we've got to admit, it looks like TI is the current champ in terms of universal acceptability, but we can't argue too much with a figure like that.