We know shit. As proven multiple times. Even while we discuss this we presume all, while we presume we speak bullshit. Universe and life in it is something that we understand just 1%. You answer one question, lucky that u are so smart, and then see that it was totally wrong and like 1 000 000 new questions arose.
Not an easy feeling that we will sooner be gone then ever be able to comprehend the ''big picture''. :[