Koozies carry out an awesome operate, and so they carry out it well: they keep your drink cold. Like the styrofoam cups of yore that at the moment are taking tens of millions of years to decompose in landfills, these weird artificial things have magical abilities to keep your drink chilly as heck for hours on end. An actual scientific examine from the University of Washington that proves the efficacy of the koozie. First, researchers discovered that relative humidity factors…