A group of scientists at CU-Boulder shined a light on what happens when you actually flush a toilet seat — and it’s not pretty. Using bright green lasers and camera equipment, the engineers ran an experiment to reveal how tiny water droplets, invisible to the naked eye, are rapidly ejected into the air when a lid-less, public restroom toilet is flushed. Now published in Scientific Reports, it is the first study to directly visualize the resulting aerosol plume and measure the speed and spread of