Its main crash-test building yanks a car across the floor while high-speed cameras record every crumple.

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Comcast (nasdaq: CMCSA - news - people ), the nation's largest cable company, added a record number of new high-speed users in its third quarter, leading to a 38% increase in broadband revenue from the same quarter a year ago.

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The new single-laser fiber-optic speed record was set using a technique called fast Fourier transform that pulses light at an incredibly high rate with data encoded in 325 distinct colors across the spectrum.

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