[275]

[276]



[275] Wikipedia's definition of spacetime is "any mathematical model that combines space and time into a single continuum. Spacetime is usually interpreted with space being three-dimensional and time playing the role of a fourth dimension that is of a different sort than the spatial dimensions" (http://en.wikipedia.org/wiki/Spacetime).

[276] "Stock Traders Find Speed Pays, in Milliseconds," Charles Duhigg, New York Times, July 24, 2009 (www.nytimes.com/2009/07/24/business/24trading.html?_r=2&hp).

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