The scientists were all working on space and nuclear research, sparking conspiracy theories, a federal probe, and even comments from Donald Trump At least 11 U.S. scientists linked to U.S. nuclear and space research programs have died or vanished in recent years, prompting a federal investigation into a situation President Donald Trump called “ pretty serious stuff .”  On April 20, the House Oversight Committee announced that it would look into the deaths and disappearances after committee chairman James Comer (R-Ky.) warned that “something sinister could be happening” on Fox & Friends . Comer said that at first he thought it was “some kind of crazy conspiracy theory,” but now believes it could be a national security concern.  CNN reported that the FBI is leading efforts to find connections between the missing and deceased scientists and is working with the Department of Energy, Department of Defense, and state and local law enforcement.…