The first is the advance, and increasing application, of science. As a means to the ends I care for, this is neutral. We shall grow able to cure, and to produce, more diseases—bacterial war, not bombs, might ring down the curtain—to alleviate, and to inflict, more pains, to husband, or to waste, the resources of the planet more extensively. We can become either more beneficent or more mischievous. My guess is we shall do both; mending one thing and marring another, removing old miseries and producing new ones, safeguarding ourselves here and endangering ourselves there.