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seat on virgin galactic. it's a very expensive space race. >> moving forward indeed. gio, excellent coverage all day. history made today. and a momentary break from reality. but the surge in coronavirus cases, 83% of new cases are from the delta variant. sweeping through the unvaccinated, and now affecting the vaccinated, too, with the so-called breakthrough cases. dr. fauci saying mild breakthrough cases are now to be expected. dr. rochelle walensky talking about the highly transmissible variant behind 4 of 5 new cases in this country. tonight, we're inside a memphis hospital with large numbers of