WHAT EVOLUTION IS 157 



differs from most animals, is in his 

 striking ability to use the environment 

 to his advantage. The primitive ac- 

 quisition of fire made available to 

 him such gigantic forces as we see in 

 steam, electricity, and their endless 

 applications. Who would have sus- 

 pected that the unclad savage, as he 

 warmed himself over the dying em- 

 bers, was nursing a form of energy 

 that was to do for man all that modern 

 machinery has done! Little do we 

 think as we look at a watch face that 

 shines in the dark that the changes 

 going on there foreshadow, in germ, 

 possible sources of energy for future 

 man that may be as much superior to 

 fire as fire was to ancient brawn. But 

 this may be so, and it is precisely this 

 capacity to discover and utilize to the 

 utmost such environmental changes 

 that makes man different from almost 

 all other organisms. 



