A democracy functions best when an educated citizenry votes and makes decisions based on facts and readily available information.
Superman plays the archetype of hero, in most cases, as he helps save the world from evil.
However, in "Superman vs. Batman" (i believe), Superman plays the archetype villian, as he is portrayed as one who fallen out of the law.
hope this helps
Answer:
Because oil need to penetrate very small niches inside engine. But size of these niches varies between different engines. Viscosity needs to be low enough to penetrate niche (not to stop at the edge) but high enough to stay inside and lubricate instead of just going through without much effect.
