Fred Kaplan, who gets plugged on this site even more often than Frank Ferrante, tells us lots of things I didn't know about the U.S. nuclear weapons stockpile. Apparently, Barack Obama is telling the world a lot of things they didn't know about it. Somehow, as I read this, I kept thinking of Dr. Strangelove explaining that the whole point of having a Doomsday Machine is lost if you keep it a secret…