"A book on philosophy " She admits "Apparently I should decide if I want a street car to smash five strangers, or divert to take merely two, however, the two maybe people I know, and so on. Frankly, ,the whole thing makes me twitch. How useful are the two that I know? Are they essential to my plans or merely entetaining? The five people... I have no time to learn about them... and that of course makes me wonder if they might be evenn MORE Useful... and, after switching the lever, would they be in my debt?"