Man will never fly.
“It will never go off. And I speak as an expert on explosives.”
Admiral Richard Leahy, USN, on the Atomic bomb, 1945
Man doesn’t fly with his naked body only. He has invented lots of things that he has to don or get into. Those things fly.
Your eyeballs will squish and run down your face if you travel faster than 30 mph.
How does that prove aliens have visited the Earth?