Hiroyuki Ishii, the rats under constant attack suffered less stress than the group receiving more lenient punishment.

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In one case, stress at work produced a heart attack.

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Several Algerian commentators stress their country's vulnerability to attack in the wake of the Malian crisis.

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One man even died last year from a heart attack brought on by the stress of spending days waging war in an Internet game.

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She also suffered a heart attack, which she believes was partly brought on by stress.

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And one thing I've tried to stress to them is that it'll support your candidate, but let's not attack each other.

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Clinton's efforts to stress her credentials as a fighter -- and her years of experience taking on the "Republican attack machine" -- may have resurrected baggage stowed in the nation's collective memory.

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