Re: Free energy???

Uncle Al wrote:
1) Time is homogeneous, then
2) Noether's theorem, so
3) Mass-energy is locally conserved.
4) No exceptions, no footnotes, no alernatives.

Except that time isn't homogeneous in big bang cosmology, and Noether's theorem doesn't apply. Certainly energy is locally conserved in general relativity, but it's hard to even make sense of the idea of a global conservation law in a generally covariant world. And anyway, mike3 is right. "It's impossible" is the wrong reason for rejecting claims of perpetual motion. The right reason is that the claimed result is (a) empirically very hard to achieve, and (b) extremely desirable. Whenever you have these two properties, the claim is statistically almost certain to be a scam or delusion, especially if it comes from someone with no prior reputation. This is equally true whether or not some current theory predicts that the thing is impossible.

-- Ben
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