The term 'ground zero' only has one meaning: the point on the earth's surface closest to a nuclear detonation. The area where the Twin Towers used to stand is called 'ground zero' precisely for this reason.
At Ground Zero was created in 1994.
The duration of At Ground Zero is 1.87 hours.
Picture of ground zero
Ground Zero Man was created in 1971.
Party at Ground Zero was created in 1985.
Live from Ground Zero was created in 2001.
Love from Ground Zero was created in 1998.
Ground Zero Gallery was created in 1984.
Currently, Ground Zero is still a great big gaping hole in the ground. But the new tower, "Freedom Tower," is in the early stages of construction, and is due to be completed in 2013. See the first Related Link below for the official website, and the second for a Ground Zero webcam.
The term ground zero describes the point on the Earth's surface closest to a detonation. In the case of an explosion above the ground, ground zero refers to the point on the ground directly below the detonation. The origins of the term ground zero began with the Manhattan Project and the bombing of Japan.
Zero Volts, Ground, or Earth. All current flows to this. It stand for NO POTENTIAL. A ground can be elevated to 100v that is the return for that particular circuit sitting 100 volts from earth.