Post by MikkoPost by Mikko I noticed that there are, definitely, two types of Homo, the
eastern one, and the western one. I mean, this is obvious, eastern
people are shorter and have round heads, while western people are
longer, and have more narrow faces.
I also noticed that African people definitely belong to the
western type. Now, how can that be? Per standard view eastern type
arose from Africa. I don't think that's true.
The only logical explanation should be that Homo arose from
Euroasia. There we already had two types, Asian type is from around
China, the western type from the opposite end of Euroasia, from
Europe. Africa was completely separated from Euroasia, both,
physically and in population. So, in Africa we had Australopithecus.
People in Euroasia, because of its developed coastline, were very
much in contact with sea, while African Australopithecines were more
inland. People in Euroasia developed proper language (unlike
Australopithecines), while people in Africa lagged behind a lot in
language. When Euroasian population started to produce tools, the
western type spread into Africa, extincted Australopithecines, and
this is how we got today's situation.
The difference between Africa and Euroasia (the interlocking
between humans and animals) is stunning.
http://youtu.be/DsgbdtIUtyQ
http://youtu.be/807VjIEOFzw
http://youtu.be/-WolhGgjKr0
In other words, African people were white in Euroasia, and
then turned black in Africa, and not the other way around. Lol, our
skin even has the ability to turn brown if exposed to too much sun,
it doesn't have the ability to turn white, if there isn't a sun.
When trying to find out the place of the origin, a good method is to find
the least related subgoroups or individuals. Usually they are found at or
near the place of the origin. In che case of Homo sapiens that place is in
southern Africa.
A large part of the differences between the African and other populations
can be understood as adaptations to a colder climate. Likewise the
differences between European and many Asian populations can be understood
as adaptations to even colder climate.
I don't get the first part of your answer.
Strange. I don't see anything unclear in it.
The second part you are right, there are temperature
adaptations. But, in which direction, this isn't clear at all. I
definitely agree that East Asian people are adapted to the coldest
climate.
Sweating is an obvious adaptation to high temperatures. It is found in all
humans but not much in other animals.
Hm, it looks like you don't know much about those things, I'll teach you.
For thermal insulation animals use few systems. Birds have feathers,
mammals have fur, aquatic mammals (except for sea otter) have
subcutaneous fat. Also, humans and pigs have subcutaneous fat. What is
the difference between fur and subcutaneous fat? Fur is lighter. Plus,
fur works when it is cold and when it is warm. For example, I am retired
train driver. When there were steam locomotives, train drivers used to
wear fur coats, even in summer. Because there it is very hot, near this
steam boiler, and fur protects you from heat. As you know, fat, not only
that it doesn't help in hot weather, it is actually the other way
around, it is deteriorating, it brings a lot of problems when it is hot.
But, fur has one downside, it doesn't work in water. So, animals that
come in contact with water use subcutaneous fat. This thing is so
necessary in water that even a bird, pelican, although birds have to be
as light as possible, has heavy subcutaneous fat in place where its body
sits in water.
Animals use fat to store energy. Usually this fat is somewhere inside
body (I believe it is called "brown fat"), and it is in one piece (I
believe). Subcutaneous fat is "white fat" (I believe this is how it is
called), and it is attached to skin, so it works as thermal insulator.
This is what we have. Savanna is a place where SC fat doesn't have
purpose. So savanna pig, warthog, is the only pig that doesn't have SC
fat (the only place where it has SC fat are those warts, warts are made
out of SC fat).
Now, how to deal with high temperature if you have SC fat? The best
way is what warthog has, to not have SC fat at all. At first glance it
looks like sweating is good idea. Well, sweating has one downside, for
it to work you got to have breeze, sweating works with breeze, if you
don't have breeze it will not work. For example, the other animal that
uses sweating is horse. But only while it is running (and thus it
provides its own breeze). If you put a horse where it is hot, but it
doesn't run, it will not sweat. So, why are humans sweating? First, they
cannot produce their own breeze, they cannot run as fast as horses.
Second, humans sweat even when standing still. This means that humans
evolved in area which has constant breeze. Yes, there are such areas. On
a shores of large bodies of water (like large lakes and sea) you have
constant breeze. How come? The difference between the temperature of
water and land produces constant breeze. Since we are almost the only
primate that eats meat, and an animal which doesn't have carnassials
cannot eat meat, this means that we started eating meat by the way of
eating shellfish (the other primate that eats meat is called
"crab-eating macaque"). Since we are eating salty food, this means that
we were eating sea shellfish. In other words, we evolved on a sea coast.
On a rocky coast, since we lived on cliffs (the most annoying sound
for us is nails scratching on a school blackboard, in nature, predator
nails scratching on a cliff surface, trying to climb cliffs). The most
terrifying sound for us is the alarm call of rock hyraxes (sounds like a
scream from Hitchcock's movie, "Psycho"). When we dived for shellfish,
the safest place to leave our babies is to leave them float in the sea.
This is why our babies cry. First, they mark their position by producing
as loud sound as they can (the babies of other animals tend to be
silent), because you can lose them among waves. Second, they get rid of
excess salt by shedding tears, from glands which are above eyes. Another
type of animals which has the same characteristic is plunge-diving
birds. Only, they have those glands in beaks, so they are "shedding
tears" from beaks. The fact that our babies scream from the minute they
are born is the main factor in acquiring the sound communication, we
learnt to articulate sounds in the earliest age, when animals acquire
things the fastest. The other factor is that we lived in area which is
very infested by noise (the sound of waves crushing on rocks), so we
also learnt to analyze sounds.