Which sentence contains an error? statistics is the hardest topic i've studied so far. the statistics on crime in this town are alarming. genetics is responsible for many diseases. genetics is a fascinating field of study.

London includes a quote about john thornton as he is observing hal attempt to motivate the exhausted dogs "it was idle, he knew, to get between a fool and his folly". if the word "idle" is defined as "of no real worth, importance, or significance", what does this statement mean with regard to hal? who is the fool? what is hal's folly? why would john thornton think it of no real worth or useless to intervene?