And then there was the book All the President’s Men by Bob Woodward and Carl Bernstein, the two Washington Post reporters who’d supposedly brought Nixon down. When it came out in 1974, I read it avidly. And two years later I was enthralled by the movie version, written by William Goldman and directed by Alan J. Pakula. But there was one thing - in the book and the movie - that always puzzled me. I’ll describe it as it’s presented in the film. Woodward (Robert Redford) meets late at night in a parking garage with his secret source, known as...