The behind-the-scenes tales of hit products and creations from Japan: this is Japan's Top Inventions. This time, we focus on electronic calculators. Pocket-sized calculators have become so common that everyone can have one, and are still used today. The world's first pocket-sized calculator was developed in Japan in 1972, and made calculators available to the general public for the first time. Let's discover the story behind its creation, including inspiration from a surprising source: bowling!