Using a chemical sensor, a box made of Legos, and a smartphone, researchers at the University of Texas at Austin have designed a way to detect dangerous nerve agents such as VX and sarin. The chemical sensor in the device generates fluorescence at varying colors and brightness depending on the chemical, which is picked up by the camera on the smartphone. The box made of Legos provides a light-tight space to get an accurate reading by the camera. Since the device uses Legos, it is portable, affordable, accessible, and practical for real-world scenarios. Read more about the nerve gas sensing Lego box at University of Texas at Austin.