NPR: The scientific evidence alone is not enough to prove that microbiologist Bruce Ivins was the perpetrator of the anthrax attacks that killed five people in 2001, according to an independent review panel, writes Joe Palca for NPR. The panel of scientists was convened by the National Research Council of the National Academies to review the science that the FBI used in its investigation into the attacks. After the attacks, the FBI created the Amerithrax Task Force, which interviewed thousands of witnesses and evaluated a mountain of evidence. Ivins killed himself in July 2008, just as the Justice Department was about to indict him.