As the missile nears its target, the Digital Scene Matching Area Correlation system takes over.

BBC: Tomahawk cruise missile

Officers have urged people who saw anyone matching these descriptions in the area to come forward.

BBC: Police seek three cycling suspects in Luton shooting

We should all be pretty familiar with the specs of Canon's latest mainstream DSLR, so let's skip past the new 18 megapixel CMOS sensor, SDXC memory card compatibility and high-res 3-inch LCD screen, and just focus on the one area where the Rebel T2i has a shot at matching the EOS 7D: 1080p video.

ENGADGET: Canon Rebel T2i / 550D squares off with EOS 7D in video performance test

Matching that power output with corn ethanol would require intensive farming on more than 21, 000 square miles, an area nearly the size of West Virginia.

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