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One of the smartest men who ever lived - Richard Feynman - said there was no possibility of an anti-gravity machine based upon his knowledge of the way the universe was put together.

You probably know that he was a quantum physicist, and pretty much single-handedly figured out why the Challenger was lost.

Feynman >bump<

Not sure he uncovered the O-ring issue himself, my suspiscion is that others pointed him in the right direction, if not pointing "it" (particular elastomeric material becoming rigid when cold, and therefore not appropriate for the application) out directly.

However, Feynnman deserves to get full credit for the public presentation.

Smart fellow, writes well, and presents himself as preferring to be in the company of "common folk."

9 - I do not know of/about "Richard Feynman" or his theories, but I do know about the o-rings. I know that the o-rings had been leaking for years, since they changed the putty, and just about every launch had 'near burn throughs' on the o-rings. I know because I and my brother personally talked to those servicing the shuttle SRB's, and saw photo's of many of the near-burn-throughs. And these were the guys who actually worked on the SRB segments.

I also know that the o-ring problem was so serious, they completed a design fix 17 months before the Challenger murders. 17 MONTHS. And yet NASA management wouldn't/couldn't get the gumption to fix the problem, even after it was designed.

So, I will defer on his theory that anti-gravity is impossible, particularly, since, even today, WE DON'T EVEN KNOW WHAT GRAVITY IS !!!!