This photo taken on on November 25, 2025 shows a guide demonstrating the Casio 14-A calculator, invented in 1957, at the Toshio Kashio Memorial Museum of Invention in Tokyo. Artificial intelligence may eventually call time on the humble plastic calculator, but Japan's Casio still sells tens of millions each year and even sees opportunities for expansion. Generative AI models are closing in on human mathematicians' skills -- achieving gold-level scores for the first time this year at a prestigious global competition. (Photo by GREG BAKER / AFP via Getty Images) / To go with 'JAPAN-THAILAND-BUSINESS-TECHNOLOGY-AI-CALCULATORS' by Katie Forster, with Watsamon Tri-Yasakda