Passengers wearing face masks as a precaution against the spread of Covid-19 sit in the waiting room of a railway station, in Fuyang, China, in 2023. | Sheldon Cooper/SOPA Images/LightRocket via Getty Images It’s hard to imagine modern life without glycols. They are used in cosmetics, fog machines, and food. As you read this, you’re almost certainly wearing or drinking from something they were used to produce — polyester fabric or plastic bottles, for example. If you brush your teeth with toot