The photo by Brooklyn Theory. The two blue beams are made up of 88 light bulbs that are 7,000 watts each. Visible for more than 60 miles, the powerful beacons were turned on one at a time after 8pm. The Tribute in Light's 88 powerful searchlights will project upwards from Ground Zero from dusk on September 11 until dawn on September 12.
By Ben on Sun Sep 11 2011
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A handy flow chart that helps you figure out the age of an undated world map, by xkcd. Big pic.
As the infographic below shows, the answer is quite a lot. A lot of factors are at play when...
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