Exotic Engineering: The Pais Files - When Patents Sound Like UFOs Why did the U.S. Navy defend UFO-like patents? Inside the strange case of Dr. Salvatore Pais and his gravity-defying ideas.

The U.S. Navy filed real patents for anti-gravity drives and plasma fusion reactors — then fought to prove they worked.

Inside The Pais Files:
newsfangled.co.uk/exotic-engin...

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