Re: Sabretooths

Marc Verhaegen:
Mario Petrinovich:
Marc Verhaegen:
- Human brain size should be explained as that of other animals: there
are
correlations with water, trees, varied diet, varied recent evolution
etc.

No. We have UNIQUE body thermoregulation. In our system we lose
heat through our head. ...

No, no, Mario: that's savanna believers' fanatasy (you know, running over
hot plains & radiating heat to the sky... :-D). Dean Falk (radiator
"theory") doesn't believe this herself any more I guess.
There are large blood vessels between heart & brain: the temperature of
our
blood circulation is that of our brain. In our system we lose most heat
through our body skin (& a bit through our breathing): conduction,
convection, radiation, evaporation.

I wouldn't say so. I saw some thermo-image of our body, where it was
clear that our head radiates heat. Also, it is clear that our head has hair.
It is also clear that in cold we have to cover our body, but not our face.
To me, it is clear that AAT definitely needs different thermoregulation for
parts of body that are below and above water. If we lost body hair because
of AAT and the immersion of our body in water, we definitely didn't lose it
on our head. Not that we DIDN'T lose it, we even have too much of it. Which
is quite the opposite situation from our body.

If we want to explain our big brain, we simply have to compare to other
animals with big brains, no matter their thermo-regulation.
Waterside, aquatic, arboreal, omnivorous...mammals have big brains: no
wonder humans have very big brains.

We have extremly big brain. This is an extreme situation, not seen
before or after.

- Animals with "fingers": otters, racoons, primates, phalangeroids:
trees, waterside etc.


- Fire: I have no idea, but I see no reason to believe that fire use is
older than say the Pleistocene.

Interestingly, just yesterday I saw a documentary about pebbles.
If
you have something to burn, you can find everything to burn it on pebble
beach. They explained how pebbles formed (I got the impression that all
pebble is made out of flint, but I am not sure if this is true). The most
interesting thing for me in that documentary is when narrator took one
pebble form the beach, and found some metal ball on the same beach. I
forgot
which metal that was, but he explained that this metal is very good for
producing fire, because it contains sulphur, and easily ignates. It was a
piece of cake. Fire made just like that.
I say, something made that fire which was present in Old World
ecology from 16mya till today. Some say that it is because of monsoon
climate and lightning. I say that it correlates with the emergence of
humans. I also say that Vallesian crisis correlates with the bipedality.

It's not unlikely that fire use originated through stone tool use
(sparks),
eg, at the beach, but that doesn't mean that the early apes 16 Ma made
fire.

Never-the-less, the emergence of early patches of grass 16 Ma says
that something/somebody made that fire. I am claiming that this was the case
only in the Od World. Right now scientiests are collecting deep ocean
samples from throughout the world. I am convinced that they will find that
fire was present ONLY in the Old World. This will be one step closer to
accepting that humans are the cause of fire which started 16 Ma. To me, the
today's explaination, that monsoon climate was the cause, is very, very
thin. To me, the explaination that the species that uses fire, and which
emerged at roughly the same time is the cause, is much, much better
explaination. The missbelief that we couldn't possibly be intelligent
enough, at that time, to use fire, is obviously wrong. This missbelief was
the main opstruction for accepting our early use of fire, and now that
thinking is the thing of the past (at least this SHOULD be the thing of the
past). -- Mario Petrinovich


.

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