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For that least active quartile, a single one-hour walk could potentially return a benefit of around six additional hours of life.

The study notes that there “continues to be wide variation in financial performance among hospitals, with the bottom quartile showing a net income margin of -5%, compared to +13% for the top quartile.”

"I would say Welsh is definitely in the upper quartile in terms of difficulty, so quite hard. At the same time, it's a beautiful language," he said.

“It now sits comfortably in the top quartile of the most devastating bombing campaigns ever.”

Moving from the worst-performing quartile to the top on employee retention, for example, can save a company as much as $424 million a year in costs related to turnover, the authors estimate.