Reference
OpenAI's Answer
The term "ground zero" originated from military contexts, particularly referring to the point directly above or below a nuclear explosion. However, after the September 11 attacks in 2001, it became synonymous with the site where the World Trade Center towers once stood1. This term was widely adopted in the aftermath of the attacks to describe the devastated area in Lower Manhattan.
The use of "ground zero" transformed from its previous nuclear connotations to embody the immense impact and destruction of the 9/11 attacks. Over the years, the site known as Ground Zero has been redeveloped and now includes memorials and new buildings2.
Here are some images related to Ground Zero:
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