You know why anti-gravity aircraft exist? Because gravity was just a theory.

These Things We Do, That Others May Live. gab.com/@Borescoped

In response Ghost Ezra to his Publication

Hmmm... exposing my ignorance here.

What anti-gravity aircraft?

Then the question is What is meant by "anti-gravity"?

I see planes fly most days, that's "anti-gravity", rockets go into space against "gravity".

In response Borescoped ... to his Publication

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