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November 20, 2009
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Homework Help: Science

Branches of Science

Recent Homework Questions About Science

Post a New Question | Current Questions

Atmospheric Science
The current magnitude of the greenhouse effect is measured by the difference between the emission from the surface and the emission from the top of the atmosphere, G=¦ÒTs^4 −¦ÒTe^4 ¡Ö 150 W m-2. What would be the required magnitude ...
Friday, November 20, 2009 at 4:34pm

Atmospheric Science
Show that if the planetary albedo is 0.3, a change in solar constant of 1 W/m-2 results in a global-mean climate forcing of 0.175 W/m-2.
Friday, November 20, 2009 at 4:31pm

Atmospheric Science
Estimate the rate of freshwater mass production (kg s-1) b the melting of the North American ice sheet, assuming its melting took 500 years. How does this compare with the rate of deep-water formation in the North Atlantic, which is estimated to be about 2 x 10^10 kg s-1 at pr...
Friday, November 20, 2009 at 4:30pm

science
breathing term that can make others mad
Friday, November 20, 2009 at 3:37pm

environmental science
why is sewage a problem and how have human activities contributed to this problem?
Friday, November 20, 2009 at 2:47pm

religious education
please could someone help me answer this question - can science prove that God does exist? thankyou
Friday, November 20, 2009 at 1:58pm

science-physics
An electric heater draws a a current of 10A from a 220 V supply .What is the cost of using the heater for 5 hours everyday for 30 dats if the cost of 1 unit (1 kWh)is 60 paise(indian currency)
Friday, November 20, 2009 at 6:44am

science help plzzz
how is building a skyscraper today simular to and different from the building of the pyramids
Thursday, November 19, 2009 at 11:26pm

Creative Writing
Write a minimum of a 500 word-essay or a minimum five-stanza poem using Definition or Classification and Division. (Note: If the poem is free verse, it must be at least 400 words.) Be sure to follow the developmental methods presented in this lesson. Your work must have a reco...
Thursday, November 19, 2009 at 7:40pm

science
how is building a skyscraper today simular to and different from the building of the pyramids(anykind of pyrsmids) Thnx
Thursday, November 19, 2009 at 7:37pm

Academy of Hospitality and Tourism at Erasmus
What is the earth science tables?
Thursday, November 19, 2009 at 7:10pm

science
1)Compare the properties of metals nonmetals and metolliods? 2)Why can elements and compound be considered pure substance? 3)What is the difference between colloids and suspension?
Thursday, November 19, 2009 at 5:35pm

Science
What is it caled when... A family of unreactive elements whose atoms do not gain, lose, or share valence electron
Thursday, November 19, 2009 at 5:35pm

science
1)Compare the properties of metals nonmetals and metolliods? 2)Why can elements and compound be considered pure substance? 3)What is the difference between colloids and suspension?
Thursday, November 19, 2009 at 4:45pm

science
1)Compare the properties of metals nonmetals and metolliods? 2)Why can elements and compound be considered pure substance? 3)What is the difference between colloids and suspension?
Thursday, November 19, 2009 at 4:37pm

science
Why do potatoes grown in mineral-rich soils, such as those found in Prince Edwar Island, are better tasting than those grown hydroponically?
Thursday, November 19, 2009 at 2:30pm

Science
Why would the irrigation of plants with sea water be harmful?
Thursday, November 19, 2009 at 1:53pm

Science
1) The vector sum of three vectors gives a resultant equal to zero. what can you say about the vectors? 2) Vector is 3.00 units in length and points along the positive x-axis. Vector is 4.00 units in length and points along the negative y-axis.Use graphical methods to find the...
Thursday, November 19, 2009 at 12:59am

Science
What is an element named after a country in the western hemisphere?
Wednesday, November 18, 2009 at 11:20pm

Science
What is the element on the periodic table that is named after the sixth largest cantinent?
Wednesday, November 18, 2009 at 11:09pm

science
what are some advancements to diamond mining from the 1800's to 2009
Wednesday, November 18, 2009 at 9:21pm

Science
Describe the sizes of the different digestive organs in earthworms. Which organ is the largest? How does its size make it well suited for its function?
Wednesday, November 18, 2009 at 9:20pm

French
From the list of occupations, I picked my top 5 favourite, and they were, 1. journaliste 2. Professeur 3. Dentiste 4. Cuisinière 5. infirmière My next task is- For each of your top five career choices in Activity 9, determine what 3 classes in high school you mig...
Wednesday, November 18, 2009 at 7:50pm

Science
Chromium is produced by reacting its oxide with aluminum. If 76 g of Cr2O3 and 27 g of Al completely react to form 51 g of Al2O3, how many grams of Cr are formed?
Wednesday, November 18, 2009 at 7:13pm

earth science
What effects do convection currents have on the mantle and crust that would not happen if convection currents didn't exist?
Wednesday, November 18, 2009 at 6:47pm

math
ryan left the science museum and drove south gabriel left three hours later driving 42mph faster in s effort to catch up. after 2 hours gabriel finally caught up. find ryans speed
Wednesday, November 18, 2009 at 6:35pm

science
Describe one way in which work is done (Reminder: For work to be done, the force and the distance must be in the same direction.). guitar, keyboard Can you give me an example of how to describe how work is done in one of these example please?
Wednesday, November 18, 2009 at 6:03pm

science
Describe one way in which work is done (Reminder: For work to be done, the force and the distance must be in the same direction.). guitar, keyboard Can you give me an example of how to describe how work is done in one of these example please?
Wednesday, November 18, 2009 at 4:11pm

science
What are alloys in science? i forgot
Wednesday, November 18, 2009 at 4:03pm

science
What is the differnce between collids and suspension?
Wednesday, November 18, 2009 at 4:00pm

History
What year was Frances Drake born ? ? ? Please help me. And also if you have time, I would really appreaciate it if you would go over to the science part and help me with the first question on the page. THANK YOU SOOOOOO MUCH ! ! !
Wednesday, November 18, 2009 at 2:09pm

science
Can you please tell me how to draw a scientific line graph about Conposition Of Air ? ? ?
Wednesday, November 18, 2009 at 2:00pm

science
where were ingredience found to cook many years ago?
Wednesday, November 18, 2009 at 11:59am

science
i need this questioned answered or... i will flunk out of science HELP ME!!! What are the end products of respiration????
Tuesday, November 17, 2009 at 9:47pm

Science Olympiad
I don't know if you can help me but i am in science olympiad and i dont now what to bring for the second part of physical science lab. I already tried going on their website so that did not help.
Tuesday, November 17, 2009 at 8:25pm

science
My grandson is in 4th grade. His teacher assigned the class to make a container that will keep an ice cube frozen for several hours while inside. Do you have any ideas?
Tuesday, November 17, 2009 at 7:30pm

science
what is a substance that provides nourishment to an organism
Tuesday, November 17, 2009 at 7:18pm

Science
Why do human need water?
Tuesday, November 17, 2009 at 6:53pm

8th Grade Science
by stirring a gas in a liquid,its solubility does it speed up or slow down n the dissolving process............PLEASE HELP ITS HARD
Tuesday, November 17, 2009 at 6:39pm

science
Which of the following does NOT describe a suspension? A)particles are soluble B)particles settle out over time C)particles can block light D)particles scatter light
Tuesday, November 17, 2009 at 4:52pm

science
what are three ways to make a sugar cube dissolve more quickly in water
Tuesday, November 17, 2009 at 4:37pm

science
hey i need help[ filling out this sentence..... Solubility is dependent on_______________ and_____________. plese help me thank you
Tuesday, November 17, 2009 at 4:28pm

science
What can particles in solution NOT do because ther are so small
Tuesday, November 17, 2009 at 4:11pm

7th grade science
name two scientest who studied inherited genetics and what they used for research and why
Tuesday, November 17, 2009 at 4:06pm

7th grade science
name 2 scientest who inherited traits
Tuesday, November 17, 2009 at 4:01pm

science
Define Osmosis and identify examples in which the human body uses osmosis.
Tuesday, November 17, 2009 at 2:56pm

where
where can i find a science project that is what toothpaste reacts faster with shells?
Tuesday, November 17, 2009 at 2:13pm

Earth Science
What are two forces that cause the Earth's surface to constantly change and what are their effects on the planet? Please help I do homeschooling and I'm super behind in science please answer before 12:00 p.m. on 11-17-09
Tuesday, November 17, 2009 at 12:18pm

Science
CAN I PLEASE HAVE A TRUSTED EMAIL ADDRESS TO SEND A PROJECT TO? I NEED HELP - SO MUCH SO THAT I CAN'T EXPLAIN THE PROBLEM!
Tuesday, November 17, 2009 at 3:20am

physical science
why is the weight of a car less than the actual weight
Monday, November 16, 2009 at 11:49pm

science
What will happen if the polar bear became extinct?
Monday, November 16, 2009 at 11:35pm

Science
1.You are riding your bike and you slow down to turn a corner. A.Changing Velocity B.Acceleration 2.Your are seated in a stopped car that suddenly seems to be rolling backward.You use the street to realize the bus next to you is going forward A.Reference Point B.Displacement
Monday, November 16, 2009 at 9:44pm

science
a teacher does 140 J of work in 20 s. How much power did he use?
Monday, November 16, 2009 at 9:22pm

science
in the course of a short race,a car does 50,000 J of work in 7 s. What is the power of the car during a race?
Monday, November 16, 2009 at 9:21pm

science
a libraian lifts a box of books that weighs 93 N a distance of 1.5 m. How much work does he do?
Monday, November 16, 2009 at 9:18pm

science
as you push a lawnmower the horizontal force is 300 N. If you push the mower a distance of 500 m, how much work do you do?
Monday, November 16, 2009 at 9:17pm

science
Can you tell about velocity, accelration, motion, position, friction, gravity, weight and gravitation. i mean 4th grade velocity.
Monday, November 16, 2009 at 8:16pm

science
Can you tell me more about velocity, accelration, motion, position, friction, gravity, weight and gravitation.
Monday, November 16, 2009 at 6:18pm

Science
Mole Conversions Problem: 3.80 mol Li = ____________ atoms Li.
Monday, November 16, 2009 at 4:22pm

Science
I am in 6th grade and doing very well so i am not stupid or anything but i dont know if my science fair project is for my grade level. It's What Makes Ice Melt The Fastest. What Do You Think? Thnak You
Monday, November 16, 2009 at 6:59am

biological science
What are the characteristics of non-living things?
Sunday, November 15, 2009 at 11:00pm

physical science
What mass of NaCl do you need to make 71g of Cl2?
Sunday, November 15, 2009 at 10:17pm

science
dr.bob222 i dont get it can u give me the answer
Sunday, November 15, 2009 at 10:10pm

science
how much power, in watts, is needed to cut a lawn in 50 min if the work ivolvled is 100,000 j
Sunday, November 15, 2009 at 9:53pm

science
how much power, in watts, is needed to cut a lawn in 50 min if the work ivolvled is 100,000 j
Sunday, November 15, 2009 at 9:53pm

science
suppose you are pulling a wagon with the handle at an angle. How can you make your task easier?
Sunday, November 15, 2009 at 9:45pm

science
how much power, in watts, is needed to cut a lawn in 50 min if the work ivolvled is 100,000 j
Sunday, November 15, 2009 at 9:37pm

8th grade Science
Please help need ideas I am building a 3D model of a plant and animal cell. I need to show diffusion and osmosis movement within the cell.
Sunday, November 15, 2009 at 8:34am

science
A 400kg sports car collides with a stopped pickup 40m/s. After the collision, the sports car stops and the pickup moves forward at 15m/s. What is the momentum of the sports car before the collision? What is it the mass of the pickup?
Saturday, November 14, 2009 at 8:14pm

science
A 400kg sports car collides with a stopped pickup 40m/s. After the collision, the sports car stops and the pickup moves forward at 15m/s. What is the momentum of the sports car before the collision?
Saturday, November 14, 2009 at 7:52pm

Physical Science
A red light source and a green light source shine on a white screen. what color will the screen be? Explain your answer. If a blue object is placed in front of the screen, what color will it be? explain your answer
Saturday, November 14, 2009 at 4:27pm

Physical Science
Suppose you want to heat 40 kg of water by 20 C. How many joules of heat are required?
Saturday, November 14, 2009 at 3:52pm

Physical Science
If an engine must do 500 joules of work to pull a 100 N load up to a height of 4 meters, What is the efficiency of the engine?
Saturday, November 14, 2009 at 3:22pm

science
oe do Orchid Glads grow
Saturday, November 14, 2009 at 10:26am

science
electricity- give 2 examples of using cells......... ive put clocks and laptops i not sure if this is right. thanks for your help!
Saturday, November 14, 2009 at 7:26am

crt thinking
Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in t...
Saturday, November 14, 2009 at 12:17am

aed201
In hindsight, were there some things you could have done differently in terms of this science activity
Friday, November 13, 2009 at 11:48pm

Physical Science
How many calories of heat are required to raise the temperature of 550g of water from 12.0 degrees celcius to 18.0 degrees celcuis
Friday, November 13, 2009 at 6:59pm

Science
Does anyone know of a website that has all of the 20 amino acids not just the name but the actual thing like c-oh thing? thanks so much!!!
Friday, November 13, 2009 at 6:27pm

science(chemistry)
Using condensed electron configurations and Lewis electron-dot symbols to depict the monatomic ions formed from each of the following reactants, predict the formula of the compound the ions produce. 1) K and P
Friday, November 13, 2009 at 5:47pm

science
Which of the following is NOT true about compounds? A) compounds join in specific ratios according to their masses B) the mass ratio of a specific compound is always the same C) compounds are random combinations of elements D) different mass ratio mean different compounds
Friday, November 13, 2009 at 4:59pm

science
i did a lab experiement and I do not know what was the control group. I tested the rates of cellular respiration for: Germinated, room temperature peas Non-germinated, room temperature peas Germinated, cool temperature peas Which one is the control group and how do you figure ...
Friday, November 13, 2009 at 2:30pm

science
For the reaction 2Na(s) + Cl(g) ¨2NaCl(s), how many grams of NaCl could be produced from 103.0 g of Na and 13.0 L of Cl (at STP)?
Friday, November 13, 2009 at 2:13pm

science
HOw has the artificial limb improved in efficiency over time since it started being used?
Friday, November 13, 2009 at 11:32am

science
Which of the following would be the limiting reagent in the reaction shown below? There are 50 molecules of O2 and 50 molecules of H2. 2H2(g) + O2(g) ==> 2H2O(g)
Friday, November 13, 2009 at 10:57am

SCIENCE
A uniform ladder which is 10metres long and weighs 300newtons leans with its upper end against smooth vertical wall and its lower end on arough ground.the bottom of the ladder is 6metres from the base of the wall.a man weighing 700newtons stands on the ladder at a point 6metre...
Friday, November 13, 2009 at 8:02am

science
describe the energy changes that takes place when a baseball bat is swung
Friday, November 13, 2009 at 2:23am

6th grade Science
A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. what are the gentypes of the parents?
Thursday, November 12, 2009 at 11:18pm

science
how far something travels in a certain amount of time is the?
Thursday, November 12, 2009 at 10:23pm

science
whats the word for these 2 defenitions hear it goes if you know your speed and the time you traveled you can find the?ok now the second question how far something travels in a certain amount of time .
Thursday, November 12, 2009 at 10:00pm

science PLEASE HELP URGENT:(
how do i convert 4 g/ml to kg/m^3 ?
Thursday, November 12, 2009 at 9:50pm

Science
Need help on this multiple choice question, thanks! Microscopic airborne particulates that reflect incoming solar radiation and thereby tend to cool the atmosphere are called: a. CFCs b. aerosols c. greenhouse gases d. indoor air pollutants e. hazardous air pollutants Thanks a...
Thursday, November 12, 2009 at 9:41pm

Science
what are three ways sound can be heard
Thursday, November 12, 2009 at 8:24pm

science
explain why certain bugs can walk on water
Thursday, November 12, 2009 at 7:05pm

science
What causes surface tension in water?
Thursday, November 12, 2009 at 7:05pm

science
why do beads of water form on a slippery surface,such as a freshly waxed car?
Thursday, November 12, 2009 at 7:02pm

science
how can i describe how an elevation is shown on topographic map
Thursday, November 12, 2009 at 4:54pm

science
Is holding a book while walking work? Why or why not ok
Thursday, November 12, 2009 at 4:51pm

science
is holding a book while walking work? why or why not that is the question
Thursday, November 12, 2009 at 4:45pm

science
is holding a book while walking work? why or why not
Thursday, November 12, 2009 at 4:37pm

Atmospheric Science
Assuming geostrophic balance, and a 1000 mb gradient of 30 m in 60 nm, what wind velocity does this imply at: Seattle, Washington College Station, TX Veracruz, Mexico San Jose, Costa Rica
Thursday, November 12, 2009 at 1:54pm

Atmospheric Science
Assuming that the base of a building is 330 ft. above sea level, give a total correction to sea level for the station pressure of -664 N/m^2.
Thursday, November 12, 2009 at 1:52pm

Atmospheric Science
Wind is blowing from Lubbock to Abilene at 10 knots. Assuming a uniform and gradual slope between the two cities, what is the implied sign and magnitude of w resulting purely from this orographic influence? Will this wind warm or cool in transit, and by how much?
Thursday, November 12, 2009 at 1:49pm

Science, Technology and Culture
I have to create a case study on The Impact of technology on telecommunications. I do not know where to start or what a case study looks like. I have to have two sources that are interviews. I work for a AT&T Call Center but I don't know how to make a case study about it.
Wednesday, November 11, 2009 at 10:32pm

Atmospheric Science
The 15th floor meteorological observatory of the O&M building is 188 ft from the level of the main entrance. Assume that the temperature at the entrance is 25 degrees Celcius, that station pressure is 1000 mb, and the mixing ration is .010 kg/kg. What is the actual (station) p...
Wednesday, November 11, 2009 at 10:28pm

science
how can i describe one type of heating system, and describe how it tansfers energy to warm that air inside the rooms?
Wednesday, November 11, 2009 at 9:09pm

science
how do i convert 4 g/ml to kg/m^3 ? ur help is appreciated :)
Wednesday, November 11, 2009 at 8:48pm

science
What is a chemical reation?
Wednesday, November 11, 2009 at 7:33pm

science
Meters per second(m/sec) is a unit of what?
Wednesday, November 11, 2009 at 6:51pm

science
does the color of shingles affect the temperature inside your house?
Wednesday, November 11, 2009 at 6:08pm

science
which of earth's spheres extends into all others
Wednesday, November 11, 2009 at 3:36pm

science
which of earth's spheres extends into all others? i think it would be the Biosphere because overlaps virtually the entire hydrosphere and portions of the atmosphere
Wednesday, November 11, 2009 at 3:21pm

science
on a large-scale topographic map, how are airports and major highways treated differently than houses and small features? someone help me with this question?
Wednesday, November 11, 2009 at 2:36pm

intergrated science
what is the meaning of meukaemia
Wednesday, November 11, 2009 at 2:27pm

science
what are the curved lines on a map?
Wednesday, November 11, 2009 at 2:19pm

science
on a large-scale topographic map, how are airports and major highways treated differently than houses and small features?
Wednesday, November 11, 2009 at 2:16pm

science
Which of Earth's spheres extends into all others? explain how
Wednesday, November 11, 2009 at 2:14pm

science
on a large-scale topographic map, how are airports and major highways treated differently than houses and small features?
Wednesday, November 11, 2009 at 1:47pm

science
Which of Earth's spheres extends into all others? explain how
Wednesday, November 11, 2009 at 1:46pm

Science
Allie was setting up a fish tank in her room. She needed to find a tank that would fit on her table. What metric unit should she use to record the volume?
Wednesday, November 11, 2009 at 1:45pm

science
how have computers changed mapmaking in recent years? And What is the Global Positioning System?
Wednesday, November 11, 2009 at 1:44pm

science
explain what the grid of straight and curved lines is on a map
Wednesday, November 11, 2009 at 1:42pm

science
how can we differentiate a mineral acid and base from organic ones
Wednesday, November 11, 2009 at 10:43am

Science
Megan, Jose, Austin, and Timothy are driving from Atlanta to Orlando which is a total of four hundred miles. They each left at 6:45 a.m. Everyone has been driving at different average speeds. Figure out the average speed of each driver. 1. Jose's friend is driving from Or...
Tuesday, November 10, 2009 at 11:04pm

science
Can you help me balance some equations? I tried and failed several times... 1. calcium hydroxide + phosphoric acid yield calcium phosphate + water 2. copper + sulfuric acid yield copper(II) Sulfate + water + sulfur dioxide 3. hydrogen + nitrogen monoxide yield water + nitrogen...
Tuesday, November 10, 2009 at 11:01pm

Marine Science
How much of the oxygen we breathe is produced by pytoplankton? 20%, 35%, 50%, 7% I think the answer is 50%. Am I correct. All of the following are adaptations some phytoplankton have for floating except? 1) Cells have large cavity in the center 2) spines 3) reducing surface ar...
Tuesday, November 10, 2009 at 9:51pm

Computer Science
Could someone show me an example of a service class that reads an input file (Java)?
Tuesday, November 10, 2009 at 8:15pm

science
how is cell division different than mitosis?
Tuesday, November 10, 2009 at 7:31pm

science
how is DNA copied?
Tuesday, November 10, 2009 at 7:12pm

Science
a plane traveling 70mph drops a stone and it lands on the ground 8 seconds later. how high up is the plane?
Tuesday, November 10, 2009 at 6:56pm

Science
a plane traveling 70mph drops a stone and it lands on the ground 8 seconds later. how high up is the plane?
Tuesday, November 10, 2009 at 6:43pm

science
a ball is thrown into the air with an initial velocity of 30m\s and a horizontal velocity of 10m\s. What's it's speed after 4 seconds?
Tuesday, November 10, 2009 at 6:40pm

science
what could be the cause of continental drift?
Tuesday, November 10, 2009 at 6:22pm

science
you are the ceo of an Explosive company you hired an explosive expert named john and your paying john the explosion expert at $24.50 an hour while on the job there was an explosion that blew john 1 mile into the air as ceo you decide to dock his pay for how long he was in the ...
Tuesday, November 10, 2009 at 5:58pm

science
Why does a helium-filled balloon float up when it is released?
Tuesday, November 10, 2009 at 5:51pm

science
Which of the following in NOT a physical or chemical change? A)crushing B)weighing C)melting D)passing electric current
Tuesday, November 10, 2009 at 5:42pm

science
Yet another question about cells. Is it true that... the colour of a necleus has not yet been discovered? Thanks
Tuesday, November 10, 2009 at 5:10pm

science
Is this true, the endoplasimc reticulum (sorry if spelt wrong) is transparent? Thanks
Tuesday, November 10, 2009 at 5:04pm

science
I'm confused, are golgi apparatus and golgi bodies the same thing? Thanks for your help.
Tuesday, November 10, 2009 at 3:57pm

science
how many grams of KCI can dissolve in 100g of H20 at 40degrees c
Tuesday, November 10, 2009 at 3:55pm

science
what is the volume of water ? how do I describe this ?
Tuesday, November 10, 2009 at 3:47pm

Science
When elemental sulfur,S8,is heated with AgF,a gas forms that contains only sulfur and fluorine. The following tests were done to characterize this gaseous product. *The density of the gas was found to be 0.807g/L at 152mmHg and 35 degrees celsius. *When the gas reacts with wat...
Tuesday, November 10, 2009 at 2:08pm

physcal science/physics
what is the kinetic energy in joules of a 1000 kg car travelling at 90km/h
Tuesday, November 10, 2009 at 1:39pm

science
it has at lease one meal and one nonmetal element. compound salt
Monday, November 9, 2009 at 11:03pm

science
A atom of iron(mass 10-25 kg) travels at a speed between 20.0 and 20.1 m/s. How accurately can we determine its position?
Monday, November 9, 2009 at 11:02pm

science
I need a slogan for neon for this science project my teacher assigned
Monday, November 9, 2009 at 10:59pm

science
Is this true, animal cells are squire/rectangular and plant cells are circular? If so, why?
Monday, November 9, 2009 at 7:17pm

science
If I were to make and edible cell, using cake and other materials, such as liquirice and candy or by using a bagel, which do you believe would receive a better grade?
Monday, November 9, 2009 at 7:02pm

science
can someone help me with this please it is hard! what is the force on a 32kg door slammed with a force of 12N? How do i solve this. thaks
Monday, November 9, 2009 at 6:53pm

science
what results from tension betweenrock layers?
Monday, November 9, 2009 at 6:38pm

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