It's a shocking indictment on the training of doctors. These are intelligent men, highly skilled, one of them a neurologist even. And yet they can't build a working bomb between them! I mean ... it's not rocket science! (Uh ... well actually, given the amount of explosive materials it probably is.)
Never mind, they can at least fall back on the "Bones" defence :
"I'm a doctor, dammit, not an explosives engineer!"