We also know, anecdotally, of how, in the past decade, millions more Americans have become dependent on food stamps and on jobless benefits (not just for the six-month normal duration, but now for as long as two years).

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Intensity and duration of these feelings distinguish a normal level of stress from a psychological condition, Kleiman said.

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Meanwhile, the duration of the loans will revert to the normal overnight period from 30 days come mid-March.

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Verizon, the main New York phone company, has now said that it will make all 4, 000 of its public payphones in the city free "for the duration of the current emergency", and unlike in normal times would lift the bar on incoming calls.

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