Prof Kivimaki said the evidence of a direct effect of job strain on the heart was mixed.

BBC: Work stress 'raises heart risk'

Swine flu is caused by a virus similar to the regular flu virus that circulates in people every year, but is a strain that is typically found only in pigs or in people who have direct contact with pigs.

CNN: CDC: Swine flu seen in 2 California children

Swine flu is caused by a virus similar to the type of flu virus that, in various forms, infects people every year, but is a strain typically found only in pigs -- or in people who have direct contact with pigs.

CNN: Among the swine flu mysteries: Why only deaths in Mexico?