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Physical activity, though generally beneficial for the heart, may in some cases increase a person's risk for heart disease, a study published Monday by the journal Heart found. This is because exercise can cause calcium deposits, called plaque, to build up more quickly in the coronary arteries, the researchers said. Study participants who exercised regularly had larger calcium deposits in their coronary arteries, the data showed. However, even in those with this increased plaque accumulation, regular physical activity's ability to help people maintain a healthy weight and strengthen the heart and lungs outweighs any potential risks, according to the researchers....

Nukes unlikely to be affected by Musharraf leaving By MATTHEW PENNINGTON, Associated Press Writer Tue Aug 19, 12:38 AM ET Pervez Musharraf's departure from the presidency is unlikely to have a significant impact on how Pakistan's nuclear weapons are controlled. Experts say a 10-member committee, and not just the president, makes decisions on how to use them and only a complete meltdown in governance — still a distant prospect in Pakistan — could put the atomic bomb in the hands of extremists. "Pakistan's nuclear assets are not one man's property," said Maria Sultan, a defense analyst and director at the...