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We must discuss now the mystery of where and when modern man appeared on the world scene. Although an upright, walking man called Homo erectus was wide spread in Asia, Africa and Europe some one-half million years ago, using fire and simple hand-axes and tools, the first fossils which appear to be those of a race more closely related to our modern races ( Homo sapiens ) have been found at Swanscombe in England and Steinheim in Germany. An apparent close "cousin" of these men and a variant of Homo sapiens , the Neandertahaler, lived during the last Ice Ages throughout Europe, North Africa, the Mid-east and apparently a few even in Asia, but this particular race for some reason did not survive. Nevertheless, the Neanderthal man was a skilled hunter, used fire, cooked food and buried his dead. Only 50% survived to age twenty and nine out of ten of those remaining died before their fortieth birthday. They were subject to rickets, something that may have resembled congenital syphilis and were probably cannibalistic. There is some evidence in the fossils of the Near East that some authorities interpret as indicating that modern man, in the sense of our own sub-species, Homo sapiens sapiens , evolved from or out of Neanderthal man around 35,000 to 40,000 years ago, but this is not the consensus. Most anthropologists assume that over several eons a new breed of man, which might be called the "Ur-race", spread out to populate the Eurasian land mass, replacing or extinguishing any pre-existing hominoids. A further development of this theory necessitates the assumption of the isolation of various groups behind geological barriers, each adopting and adapting to their separate environments and gradually differentiating into present day races. Thus, the stay-at-homes became the Caucasoids, those moving into Central Asia and northern China became the Mongoloids through adaptation to severe cold, while the groups moving into hot Africa became Negroids. But these are only theories and a few authorities would disagree. Chief among these, perhaps, is Dr. Carleton Coon of Harvard who believes in the multiple origins of the various races.

Modern man in Europe was initially represented by the Cro-Magnons - with large bones, high brows and powerful physiques, standing as high as six feet four inches, similar to some Europeans of today. Other representatives of modern Homo sapiens sapiens were also present at about this time, including one smaller and almost frail in comparison. This was Combe Capelle man, apparently related to the Mediterranean peoples of today.

Although these new men, identified in Europe by about 37,000 years ago, carried a number of new types of tools, more importantly, according to recent extensive studies of these tools and remaining implements, this man had the brain which man has today, a brain capable of art, imagery and notation and of seeing the world in a time-factored and time-factoring way. We shall hear more about these features later. (Ref. 130 )

After 10,000 B.C. with the retreat of the ice, vegetation patterns began to alter. Reindeer followed mosses and ferns at the ice edge and people dependent on them followed. With warm winds, great fields of wild grain appeared in various areas of the Near East. Eventually the people began deliberate cultivation and domestication of livestock, but the original practices soon turned fertile land into desert and a controlled irrigation system had to be discovered. Raw grain and the human digestive system are not compatible so one might ask how grain could be cooked in the days before pottery. On occasions large shells, stomachs of animals, pit stones, etc. were in limited use, but probably the chief method was to heat the threshing floor to a high enough temperature to roast the grain at the same time that the chaff was splintered. The result would be a coarse groat, needing no further cooking but too dry to swallow. Add water and knead to a stiff paste and one has something comparable to the Greek maza ), Roman puls , the Mexican tortilla , Scots oat cake, East Indian chapate , Chinese pao-ping , Ethiopian injera and the American Indian Johnnycake' all of these were probably descendants of Neolithic bread, just with differing basic grains. (Ref. 211 )

Questions & Answers

Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
Kate Reply
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Kate Reply
what is the change in momentum of a body?
Eunice Reply
what is a capacitor?
Raymond Reply
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
Maria Reply
please solve
Sharon
8m/s²
Aishat
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
Saheed Reply
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
Ramon Reply
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
definitely of physics
Haryormhidey Reply
how many start and codon
Esrael Reply
what is field
Felix Reply
physics, biology and chemistry this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
WISDOM Reply
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
Belty Reply
a=v/t. a=f/m a
IHUMA
innocent
Adah
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
Nassze Reply
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
JALLAH Reply
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you. Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
What is specific heat capacity
Destiny Reply
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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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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