Originally Posted by e90im
Columbus sailed to India and serendipityously found US of A!!!! Proof.
Air exist. You can prove that it does with the water hose. PM me and I’ll show you how…Have you graduated high school?
Aliens? You are backing up agnostic point of view. Until there’s evidence of ALF, we can only speculate and withhold judgment….
You asked what is the difference between not KNOWING and not EXISTING.
Columbus DID NOT KNOW they existed and regardless of that information they existed.
Air is invisible, we cannot see it, we cannot touch it, but WE now know what it is, but how many centuries of human existence did we not have any comprehension of "air"?
Aliens will or will not exist regardless of us ever seeing one.