"It is quite incorrect to believe that the dead are gone forever and never return to speak to the living. They return to speak to the living all the time; indeed, it is their main activity." Thus writes Sylvie Weil in this illuminating memoir, in which contemporary readers can hear the voices of her famed philosopher aunt Simone and mathematician father Andr . Born into a freethinking Jewish family in France in 1909, Simone Weil was...