In recent years, there has been increasing demand for the examination of molecules, ions, bacteria, viruses, and other things invisible to the naked eye that can influence humans both positively and negatively. Until now, identifying them has required bulky, expensive equipment and specialized knowledge. However, Associate Professor Tsuyoshi Minami of #UTokyo_IIS is changing all that with the introduction of handy, low-cost sensors that rely on pigmentary change or electronic chips.