New York Times: Two physicists have analyzed Pentagon images of interception tests and concluded that the SM-3 antimissile missile is not “proven and effective,” as President Obama has described it. The dispute centers on what counts as a successful interception: destroying the warhead, as MIT’s Theodore Postol and Cornell’s George Lewis say, or hitting any part of the missile, as the Pentagon says. The distinction is important, Postol and Lewis argue, because a nudged-off-course nuclear missile could still detonate.