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North america

At sometime between 40,000 and 10,000 B.C. human hunting groups occupied all the main land masses of earth except Antarctica. Men reached America about 20,000 B.C. (perhaps earlier) from Asia over a land bridge between Asia and Alaska, varying from three hundred to one thousand miles wide and apparently including the Aleutian Islands where blades and burins, perhaps dating back to 10,000 B.C. have been found. Otherwise the earliest known cultures of the American far north have not been well dated

Trager (Ref. 222 ) even states that racemization tests on bone suggest that Neanderthal man may have been on the west coast of the western hemisphere at 50,000 B.C., but we have not seen confirmation from any other author and Trager does not reveal his source material.
. The so-called British Mountain Culture near the Yukon Arctic coast is probably the oldest, with artifacts of eastern Siberia, including crude instruments and shaping tools. There, in the Old Crow Basin, the first known occupation site in the New World has been tentatively carbon-dated to 25,000 B.C. The inhabitants were skilled users of bone, using mammoth and horse bone, the latter animals ranging in size from ponies to Percherons. Jaws of domesticated dogs appear to be 30,000 years old. At any rate, the people who came over the land bridge apparently simply followed their prey animals and were of a basic, general Mongoloid stock with skulls not much different from Caucasians and their descendants became the American Indians. The tools and skills spread from Asia to America with them and included the stone adze, spoons, combs of bone or horn, the toggle harpoon and eventually the bow and arrow. Marshack (Ref. 130 ) says the American Indians came in waves from Asia over a period of perhaps 20,000 years with some as late as 2,000 B.C. The latter figure is not further explained. We know that the land bridge was present off and on over several millennia, but never as late as 2,000 B.C. It is interesting that as late as 1962 this theory of the Asiatic origin of the American aborigines was not universally accepted. Greeman (Ref. 78 ) was committed to diffusion across the north Atlantic in skin-covered boats in the Upper Paleolithic times. He felt that Sandia Culture material in America was the same as the Solutrean of the Montaut site in southwest France. Blood typing studies beginning with Boyd (Ref. 17 ) in 1963 probably laid this theory to rest.

The great bulk of the people coming over the Bering land bridge may not have been able to migrate down into the region of the United States and farther south until about 12,000 years ago when the ice that had previously almost covered Canada finally melted enough to open a corridor east of the Rockies, at which time the Mongoloid hunters poured through to the gamelands of the American plains. Dr. Knut Fladmark (as quoted by Canby [Ref. 22 ]) of British Columbia argues that some men could have come south when the corridor was closed by leapfrogging down the coast where there were many ice-free pockets, by boat. Furthermore, recent work shows positively that much of the coast line and island archipelago off the coast of southern Alaska was never covered by glaciers at any time. (Ref. 239 )

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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