The Delta variant is here. It's now responsible for the majority of COVID-19 infections in the United States and is driving a rapid rise in cases, not only in red states like Arkansas but in true blue New York City. But while the Delta variant is much more contagious than either the original strain or the Alpha variant that first appeared in Britain, and has shown greater ability to infect vaccinated individuals, all the vaccines approved for use in the United States have so far proven highly effective in preventing severe disease and death. So it's understandably maddening that much...