The researchers drove more than 1, 140 miles at night using thermal imaging cameras to spot deer and provide an accurate estimate of their true numbers.

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First, budget projections depend on an accurate estimate of economic growth.

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But an accurate estimate of how many people died may not be available for some time, Imperato says, because it will require tallying up missing people, many of whom were swept away from where they died or out to sea.

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In order to estimate an accurate count of losses from piracy, look at the consumption rates of pirated titles, not the sheer numbers of books downloaded.

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The latest effort reconciles the differences among dozens of earlier measurements and includes new data to compile an estimate that is believed to be twice as accurate as previous ones, according to researchers involved.

WSJ: Polar Ice Sheets Melt at Faster Pace