Hello, One topic I would like to discuss here is the comparison of our understanding and knowledge of the cosmos, matter, energy, evolution and the existence in general WITH that of the other "civilizations" if they exist elsewhere in the cosmos. I am just curious...if someday we visited "other civilizations" or they visited us and let's say we could somehow manage to communicate and debate with them in a common language like English. Would their knowledge of the cosmos and existence be in line with ours? Would their chemistry, physics, mathematics, cosmology, biology, engineering... textbooks match up with that of ours? What if our theories totally contradicted theirs and vice versa? Which evidence is to be trusted, theirs, ours, both, or none????