According to "1921: Marie Curie Visits the U. S.," what was the reason for Marie Curie's visit to America? Question 1 options:

to help raise money to buy a gram of radium for use at the Institute of Radium

to campaign for the re-election of President Warren G. Harding

to sell some of the precious radium that she used in her scientific research

to persuade Mrs. W. B. Meloney to be her benefactress

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?