Science & Mathematics - 5 January 2007

As far as i know all homo sapiens came from africa. Since then we have this great diversity in characteristics like faces, skin color etc
If we move a population from Sweden to central Africa and one from c. Africa to Sweden. Will the two populations change (skin color, anatomy etc) lets say in a few or many generations or even in 50.000 years (wich if i'm not wrong is the time that homo sapiens excists)?

2007-01-05 01:13:24 · 7 answers · asked by curious_greek 2 in Biology

At least 7 of them

2007-01-05 01:12:12 · 4 answers · asked by free3rhyme2k3 1 in Mathematics

i need some exhaustive info's... if possible

2007-01-05 01:10:44 · 3 answers · asked by itoy 1 in Mathematics

in general

2007-01-05 01:10:38 · 19 answers · asked by Anonymous in Mathematics

2007-01-05 01:09:37 · 9 answers · asked by frjameskuttykandam 1 in Astronomy & Space

2007-01-05 01:07:49 · 18 answers · asked by Anonymous in Astronomy & Space

2007-01-05 01:07:28 · 4 answers · asked by frjameskuttykandam 1 in Astronomy & Space

If by electolysis water can be broken up into hydrogen and oxygen, hydrogen can be used as fuel in cars instead of gas and oxygen will help hydrogen to burn. this will be a source of renewable source of energy and will aid in controlling pollution

2007-01-05 01:04:18 · 5 answers · asked by BALA M 1 in Chemistry

Air is a mixture of different gases.But we inhale only oxygen.Why?

2007-01-05 01:04:07 · 9 answers · asked by mishi khan 1 in Chemistry

Is it a unusual appearance of planet venus or mars when people saw a star* where jesus christ was born?please answer me with proof.........

2007-01-05 01:00:59 · 5 answers · asked by Anonymous in Geography

A uniform pulley has a mass of 20kg and a radius of 150mm. A rope passes over it and is attached to a load of 10kg. What force must be applied to the other end of the rope to give the load an upward acceleration of 0.2m/s? Can anyone help me out with the formulas for this?

2007-01-05 01:00:19 · 4 answers · asked by catchinit 1 in Engineering

As is obvious, the seasons are fast changing, sometimes much earlier or later or more intense. i sincerely hope things are being put in place to help revert the ultimate consequence.

2007-01-05 00:59:04 · 3 answers · asked by ace2ice 1 in Earth Sciences & Geology

needed for undergraduate project. useful websites appreciated

2007-01-05 00:56:51 · 1 answers · asked by kamozi 1 in Chemistry

With our superior fire power projected from the mother ship hiding behind an invisible cloaking device in the outer plazma layer. Does anyone have any objections or should we wait to recolonise until after you lot have had your din dins tonight? See tyranny with compassion....

2007-01-05 00:56:22 · 12 answers · asked by mizzsquitz 3 in Astronomy & Space

2007-01-05 00:56:08 · 2 answers · asked by Iain M 1 in Physics

I know that sentence is wrong about grammar
( I am bad at E, so please correct it ^.^ )

2007-01-05 00:55:26 · 3 answers · asked by Bích Ngá» 2 in Chemistry

I'm Looking for How and why Tempered glass breaks how it does (Not how its made)

2007-01-05 00:53:48 · 1 answers · asked by Lyn 1 in Physics

I got concerned with this matter because I stored my medicine inside my cabinet. There was an instruction that it should be stored between 15-30 degrees. This afternoon, I felt that the temperature inside of my cabinet is more than 30 degrees. I read that medicines do breakdown when stored in a hot temperature. If it did ever happen to my medicine, will it still be able to regain its proper composition and be as effective as it should be? I began to store it inside the refrigerator, will this solve the breakdown of the medicine? Calling some of the good doctors there who can enlighten me about this matter.

2007-01-05 00:50:06 · 2 answers · asked by Deyda 2 in Medicine

if it were possible to get inside a beam of light ,in between photons in that little dark area we were talking about what would we see if we looked forwards in the direction of the firing protons. we no if i proton is fired of in the direction of our eye we will see light as light travels forwards my question in simplified terms is" what does the rear of a photon look like , surely it does not emmit light? as light goes forward, because if it does then this in itself prooves that light relects of light and it would then hit the photon behind it and relect forward again giving the illusion on infinity like two mirrors proped facing each other the relections would go on for ever and this is the reason that it doesnt bounce out the sides but stayr in a beam because it only reflects perfectly in the opposit direction that it is fired thus containing itself and kept on its trajectory fowards, when in actual fact they move backwards just as far as forwards but with a forwards momentum

2007-01-05 00:48:32 · 1 answers · asked by fragmaster3sum 2 in Physics

We denote years as BC or AD,but before BC there was nothing to base years on;so what was time called before BC?

2007-01-05 00:47:00 · 11 answers · asked by Anonymous in Biology

2007-01-05 00:45:16 · 2 answers · asked by Sara 1 in Biology

please give me the scientific reason... thank you.

2007-01-05 00:42:56 · 3 answers · asked by Stephel 3 in Astronomy & Space

The Data collected is from 3 newspapers. The Times(broadsheet), The Mirror + The Sun?The data is the amount of letters in words in a similar article in each newspaper.
The Mean,Median and Inter quartile Range are as follows
Times 4.68, 4.5, 3.7
Mirror 4.61, 4.25, 3.9
Sun 4.73, 4.2, 3.6

2007-01-05 00:38:16 · 2 answers · asked by mrlinderley 1 in Mathematics

What anatomical structures prevent the easy spread of infection from the suprahyoid region to the infrahyoid regions of the neck?

2007-01-05 00:37:45 · 1 answers · asked by rainbow 3 1 in Medicine

I need to know what Reynolds number is, and when and how we use it. It is from fluid mechanics

2007-01-05 00:35:45 · 5 answers · asked by alex 2 in Engineering

I need it because I wanna know how helicopters take off and fly. I think this question is enough for today.

2007-01-05 00:32:31 · 4 answers · asked by handakina salem 1 in Engineering

Background:The Holy Prophet Muhammad as a human being is considered to be the first human time traveller. He travelled body and soul to the seven heavens at the invitation of God on the 10th year of his prophethood from Mecca to Jerusalem to witness His Signs and Glory.This event is no myth and has been extensively recorded in Islamic and non-Islamic historians alike. The evidence of this event still exists in the form a hanging rock in Jerusalem.Go and visit it! Mankind should research this event deeply to learn the knowledge of Islam on time travel.

2007-01-05 00:31:47 · 5 answers · asked by DT 2 in Astronomy & Space

Lets say we stand in the middle of 2 plates conductor with static current.

2007-01-05 00:26:53 · 7 answers · asked by macosx.leopard 2 in Physics

2007-01-05 00:26:32 · 14 answers · asked by Melissa N 1 in Zoology

Find the height of a kite to the nearest yard if the length of a string is 140 yards and the angle of elevation to the kite is 54 degrees. Assume the kite is straight. Please explain your answer

2007-01-05 00:22:20 · 6 answers · asked by Anonymous in Mathematics