While there has been no indication that a nuclear explosion emergency is on the horizon, Ready wants to get you prepared, just in case.
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At the ready.gov link, there's this gem:
Try to maintain a distance of at least six feet between yourself and people who are not part of your household. If possible, wear a mask if you’re sheltering with people who are not a part of your household.
Yeah, like I'm going to be thinking, "HOLY SHIT WE JUST GOT NUKED!!! WHERE'S MY MASK, I DON'T WANT TO CATCH A SNIFFLE!!!"