In other industries sentiment can be tracked about cars, consumer products, pharmaceuticals, airlines, and so on.

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That same night, police squad cars searched for and tracked down three random suspects that matched the descriptions I gave.

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On the instrument panel, a graphic depicted each of the cars around us as a white rectangle and tracked its movement relative to ours.

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And new planes, like new cars, need less maintenance, one reason a plane Forbes tracked was able to take off at 6:40 a.m. in Nice and make nine flights across Europe before ending the day at 11:50 p.m. in Glasgow.

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