Think of all the things that the discovery of fire meant for the caveman:
- No more early bedtimes just because the sun went down!
- No more raw meat!
- No more cold caves in the wintertime!
But seriously, from the discovery of fire to the invention of the light bulb, turning energy into power has produced great things for the human race. In the last century and a half in particular, we have been able to harness energy in new and innovative ways.