What happens when you cough at your elbow and when you cough at your hands? Look at the drastic change

Taking advantage of these gloomy pandemic days, one of the rules you hear most often is that when you cough, do so by keeping your mouth on the inside of your elbow rather than in front of your hands.

If you are still unclear about the importance of doing so, this video from the German University of Weimar helps. See below the level of spray distribution for each case.