Water filters, urine, and beer
Mon, 15 Apr 2002 10:53:42 -0700
> > The Waterworks can filter 0.2 micron particles.
> Well, IIRC, a carbon atom is about an angstrom (0.0001 micron) across.
> I think urea molecules are considerably larger than salt ions, on the
> order of five or ten angstroms across.
So, if the urea molecule is
Ronald Reagan, and a C atom
is the laptop on which his
web browser is running, the
Waterworks will filter out
particles about the size of
> [Urea] was synthesised in 1828 by Friedrich Wohler and was the first
> organic compound to be synthesised from inorganic starting materials.
> It was found when Wohler attempted to synthesis ammonium cyanate, to
> continue a study of cyanates which he had be carrying out for several
> years. On treating silver cyanate with ammonium chloride solution he
> obtained a white crystalline material which proved identical to urea
> obtained from urine.
> This discovery prompted Wohler to write triumphantly to Berzelius:
> "I must tell you that I can make urea without the use of kidneys,
> either man or dog."
(with apologies to Knox, Berkeley,
On Quantum Decoherence:
There was a young man who said, "God
Must think it exceedingly odd
If he finds this cat
Is still where its at
When there's no one about in the Quad."
Your astonishment's odd:
*I* am always about in the Quad.
And that's why that cat
Is classically "at",
Since observed by