The Origin of Beer Mats

The original beer mats used to be placed on top of glasses. The idea was to k insects and so on and poison out of your i don't think it wasn't poisons. Sonds really measures the way your drink, and the weiht of your glass, y is its it when it's empty or when its sort of a quarter full. Because i don't soo tes drink laster than other's emty. And what if you don't want another drink? Does i just keep ordering it? Sorry, i don't understand.