Remember good cholesterol? You know, HDL cholesterol, the kind that was associated with reduced risk of stroke? Forget it. Now comes a study from researchers at Massachusetts General Hospital and the Broad Institute suggesting that people with genes that boost HDL levels  do not, in fact, have a lower risk of heart attacks. Strange. The Boston Globe reports that the scientists in looked at a gene variation that raises HDL levels, and should consequently give people a 13 percent decreased [...]