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Re: multi-step reasoning and Joule-Thompson



I recall hearing about a single trapped positron that was
transported from, I believe, Boulder to Cambridge, by truck. I think
it was lost on the return trip when the cooling system failed. If a
positron can be kept from colliding with any real matter for a period
of several days, I suspect that should qualify as a long enough mean
free path.

If you or anyone else can provide additional information about this I would
be very interested in reading more.