The world after 100 years will have changed a lot. Gas, oil, coal and all kinds of energy sources will have run out. People had to find a way to make energy. But now, energy isn't a question. The scientists created more and more things that don't need energy to work through the years. Cars no longer need oil, and the machines don't need electricity, too.
It's a new skill. You don't have to do anything to make the things work. The scientists also can use simple things to make things.… Continue