“Ground zero” refers to the point at the center of the impact of a nuclear bomb, so it is improper to talk about “building from ground zero” as if it were a place of new beginnings. You can start from scratch, or begin at zero, but if you’re at ground zero, you’re at the end.

The metaphorical extension of this term to the site of the destruction of the World Trade Center towers is, however, perfectly legitimate, but because in this case it is a place name it needs to be capitalized: “Ground Zero.”

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