Perpetual motion machines

[Nic van der Walt]

>conversion to energy of another variety the problem remains with
>exactly where the low energy state is to be found. If within the
>rotating
>machine there is a zone of infinite negative pressure or lower temp
>the "flow"  will be unidirectional. A perfect perpetual motion machine.

Simple... All you need is a micro black hole and a way to control it!
I think Heinlein described it in the fifties, so they can't even
patent it.

N. ;-)