The top science reporter for NBC News raised questions Monday about Secretary of State Hillary Clinton’s hospitalization, raising the possibility the blood clot causing isn’t linked to an earlier concussion. “It’s not exactly clear what is happening with Secretary Clinton’s health,” NBC News chief science and health correspondent Robert Bazell said “All we have is a statement from her office. The hospital isn’t saying anything and the statement from her [office] says that she had this blood clot that stemmed from the concussion and she’s being treated with blood-thinning drugs,” Bazell continued. “The problem is that usually when blood clots...