With another sweltering summer in the forecast, heat-related illnesses are once again a major concern here in Japan. This year, however, people wearing masks to prevent the spread of COVID-19 will be at an even higher risk of succumbing to the heat. This episode features new mask technology that allows for better breathability while still offering virus protection as well as a small wearable device that can instantly detect and warn wearers of dangerous increases in body temperature.