On 18/02/2013 19:32, VtSkier wrote:
>>> It took a very long time for people to learn to not shit
>>> where they eat.
>>
>> This is quite false, IMO. Not eating where
>> you shit is an evolutionary-fixed behaviour
>> going back to the first terrestrial vertebrates
>> around 350 mya. I don't know of any bird or
>> mammal species that breaks this rule. It's
>> deeply instinctive, and generally the excreta
>> of a species will smell unpleasant to it -- to
>> be left or buried some distance from resting
>> and eating places.
>
> Boy, it this a generalization which is so false that I'm snickering
> about the refutations I can think of.
It's not a generalisation. It's the expression of
an evolutionary principle, or the application of
one. Your criticisms (when they work) only
scratch the edges of my argument, and you
finally agree with my essential point:
> I will give you that nobody INTENTIONALLY shits
> where they eat.
That's all I am saying (in respect of every
species). You quite clearly (if only implicitly)
deny your original statement:
>>> It took a very long time for people to learn to not shit
>>> where they eat.
> Then find me a bird. Any bird that pays attention to where it shits
If you feed (and sleep) in trees and fly from
one to another all day, your shit is unlikely to
finish up on any food you eat. (It would be
interesting to confirm that birds avoided food
contaminated by the excreta of other birds.)
> except possibly in the nest where it lays its eggs and nurtures its
> young.
Indeed, and for most birds this is the only time
it matters.
> A chicken scratching food up from the ground will shit at
> the moment it swallows a morsel into its gizzard.
Chickens in their natural habitat have acres to
roam, and would be unlikely to encounter their
own shit (or even that of others of their own
species).
> So, no birds have a fixed behavior of not shitting where they eat.
For the obvious reason that no special behaviour is
needed -- except when nesting, when it's required
and so has evolved.
> And again, No mammalian species which does not make a nest
> equally does not have a behavioral prohibition against shitting
> where it eats. Simply observe most farm animals.
Farm animals do not present natural evolved behaviour.
Pigs do not lie in sties in the wild.
> Herding animals which do not naturally have a fixed place where
> the live do not have this prohibition.
They move on daily (or nightly) so it's never a problem.
[..]
> In your notations about Dr. Snow, who should be a hero to all of
> us, you mention the well/cesspit combination that turned him
> onto the probability that sewage contamination was the cause of
> the cholera outbreak. Well there was "some distance" between
> where a person shits (cesspit) and where he eats or drinks (the
> well). Clearly the "some distance" was not great enough and
> there was cross-contamination.
Sure -- "shit happens" and we can all get (or
be put) into situations where we are forced to
behave in ways that we find unpleasant.
> To get the distance to be great enough, some "LEARNING" was
> required. What we learned was that to prevent contamination of
> our food/water from waste, we needed to take our waste further
> away from where we lived.
But there was no such 'learning' until the
20th century (or late in the 19th).
[..]
> It took us a long time to learn to not shit where we eat. I stand
> behind that statement. Yes, we have a behavioral prohibition
> against shitting where we eat and we DO want to move "some
> distance" away from where we eat to defecate. However "some
> distance" is indeed amorphous, and the "safe distance" needed
> to be learned.
It became a problem only when cities expanded to
~2 million (i.e. around 1850 A.D,) -- and then not a
great one -- in terms of the numbers of deaths. So
for 6 Myr the instincts (inherited / genetic) among
hominids were more than good enough.
> And with regards to your earlier reply to other parts of this post, I
> still think that most urban living people prior to, oh say, the
> beginning of the nineteenth century, did drink mostly mildly
> alcoholic beverages.
The theory rests on the supposed belief of the
people at the time that they needed to sterilise
their water. But you now accept that they had
no such belief. So you're just hanging on to
an ancient theory which has no basis in fact,
merely because it's found a comfortable place
in your brain, and you don't want the trouble of
re-arranging your thinking.
> As for your argument that the ancient equipment to produce beer
> was expensive, it's bull.
You seem to have no idea of the conditions under
which our ancestors generally lived. Almost every-
thing was expensive. Survival was a constant
struggle. To make beer, you needed a grain
surplus, for a start. Then you needed special
equipment and room to keep it undisturbed, as
well as time, energy and light to work on it.
> Nothing is required to make beer that any
> agrarian household wouldn't have. Other mildly alcoholic drinks
> take even less equipment.
I take it you've never tried to home-brew beer? If you
can find ONE account of this going on in densely-
occupied towns and cities, at any time between (say)
1400 and 1900, you'd have a case. The home brewer
needs to be able to have a covered water-proof container
(of at least 2 gallons) not made of metal. The mix is
readily contaminated, so good sterilisation is desirable,
as is an air-tight seal, allowing the CO2 (one the yeast
starts to work) to escape though a one-way valve.
Steady temperature, under 26 degrees is important.
Before ~1950, the vessel would have to be made of
wood -- maybe something like a barrel or half-barrel.
Unless you have dedicated facilities, and you do it
for a living, then forget it before ~1950. Theoretically
you could have a brewer in every alley, supplying,
say, 20 families (with children making maybe 100
people). But that system did not exist, and there is
no point in pretending it did -- nor anything remotely
like it.
> I will give you that nobody INTENTIONALLY shits
> where they eat. A sense of smell is the biggest deterrent to this.
The 'sense of smell' is entirely genetic, of course.
The faeces of large cats present the strongest
and most obnoxious smell to humans and to all
prey animals. That is in the noses of the potential
prey, not something inherent in the faeces.
> I will point out, however, that a constant bad odor can, over time,
> be tolerated by almost anyone. Especially if that person has no or
> little choice in the matter.
Sure -- but genes evolved for the standard case,
not for rarely encountered ones. As for all other
terrestrial species, our ancestors were 'instructed'
by their genetic inheritance to keep their excreta
buried or far enough away so that its smell was
kept to a minimum. No learning was involved.
Paul.