Chocoholics do big favor for scientists

Some "chocoholics" who just couldn't give up their favorite treat to comply with a study to test blood stickiness have inadvertently done their fellow chocolate lovers - and science - a big favor. Their "offense," say researchers at Johns Hopkins led to what is believed to be the first biochemical analysis to explain why just a few squares of chocolate a day can almost halve the risk of heart attack death in some men and women by decreasing the tendency of platelets to clot in narrow blood vessels.