This makes it hard, for instance, to compare real-time video images (from a camera in the nose-cone of a missile, for example) with a set of several thousand targets (pictures of enemy aircraft, say), because all the targets have to be tested within a thirtieth of a second, the duration of a single frame of video.

ECONOMIST: Optical recognition

When we attempt a real rally, if we really have a hard time trying to make new 52-week highs in the market which I do believe we will make before the end of the year or sometime early next year then we should be looking for three major legs down into a bear market.

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According to Hilco Real Estate's Mr. Nagrani, unprofitable fast-food locations are having a hard time selling their sites to other franchisees and shutting their doors instead.

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Facebook has been trying hard to win over skeptics who doubt it can ever become as much a forum for conversation about real-time events as Twitter.

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