X-Message-Number: 20982
Date: Mon, 27 Jan 2003 05:21:25 -0500
From: Thomas Donaldson <>
Subject: CryoNet #20963 - #20971

For Yvan Bozzonetti:

There seems to be an argument here about whether nanodevices might
be created to store hydrogen at high enough densities to be useful.
For what it's worth, there are chemical methods to do this already,
one of which is being worked on by a company with the specific
intent of storing hydrogen. Borohydride (a compound of hydrogen
and boron) seems to do it well enough for use.

For Mike Peters:

Hold on a minute here! If it matters to you, you need not define
the relation between A, B, and C as that of continuer, but as
that of having characteristics historically related to one
another. B and A and C and A are both historically related, but
then (like Canada and Australia) B and C are also historically
related. It's true that B and C aren't continuers, but you may
have shown that "continuer" just isn't the right notion for the
relations you want. 

It is certainly true that we forget lots of things between 
when we were (say) 20 and when we were 50. We learn things 
too. We would like to say that we are the same (sometimes)
and different (other times). I would say myself that we are
looking at close historical relations, close being defined
as no major changes over periods of (say) one day, "major"
referring to a change important to the person before or after
it happens. BUT this is not a statement about the world,
it is an attempt to state how I feel I can be the same
as the person who did a maths PhD at the U of Chicago starting
in 1965, or did waterskying on the Ohio River when I was 15.

                Best wishes and long long life to all,

                    Thomas Donaldson

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