There are eight "hazcams" front and back, to take stereo black-and-white pictures for depth perception, and four navigation cameras ("navcams") at the top of an extendable mast.

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In the midst of law school--and before Pearl Harbor-Cap tried to enlist in Britain's Royal Air Force (he lacked the necessary depth perception), which was locked in a lethal struggle with the Luftwaffe.

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Having missed the last three majors, Karlsson played the pro-am before the SAS Masters in Sweden a month ago, but was still suffering problems with his depth perception.

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