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  #1  
Old 10-12-2005, 11:57 AM
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Default help!!!!!!!!!

help!!!!!!!!! please help me. i am a 7th grader and have no clue what to do for our upcoming science fair. i really don't care what i do just as long as i turn in something. i would prefer nothing to do with plants as i would have to start today. if you have any ideas please respond.
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  #2  
Old 10-12-2005, 12:49 PM
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Post I got an idea?

Have you been inside your house while it rains , and you are looking

out your window and the lighting comes. Have you never wonder why?

How did that happen?

Well, you make your own lighting.

You will need:

1.A large iron or a steel pot (with plastic handle) for safety.

2.Rubber gloves

3.Iron or a steel fork

4.A plastic sheet ( a dry cleaner garmet is a good source).

If you interested tell me and Iwill send the procedure for you.

Good luck !
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  #3  
Old 10-13-2005, 12:53 AM
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i know that one. You spread the plastic sheet, wear the gloves and keep rubbing the steel vessel to the plastic sheet. Rub quite a no. of times. Now carefully bring the fork near the vessel U shoulod see a bright blue spark. I've tried it out and its really cool.
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Old 10-13-2005, 08:11 AM
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Talking An easy experiment you can score 265/300 points in your science fair!

An Easy Experiment
The sky is blue because of the atmosphere - without a thick atmosphere, the sky would look just like the sky of the moon - black. We see color in our sky because, which ever direction in the sky we look, light enters our eyes and excites our retinas. This light is sunlight, but as we know light travels in a straight line, it cannot come directly from the sun. When the light from the sun hits the oxygen and nitrogen (not to mention the water vapor and smog) in our atmosphere it is scattered into our eyes.
But why is it blue? In the 1860’s Lord Rayliegh determined that small particles scatter short wavelength light more than long wavelength light. In fact, the amount of light scattered by any small (by small we mean smaller than the wavelengths we’re interested in) particle is inversly proportional to the fourth power of the wavelength. The wavelength of blue light is roughly half the wavelength of red light, so blue light is scattered almost ten times as strongly as red light.

This effect, first noticed by Tyndall in 1856 can be easily investigated: Take a clear glass and fill it with water. Shine a bright flashlight beam through the glass of clear water - the beam will be virtually invisible within the glass and, if you shine the light on a white screen, the light will be white. Now, we will introduce a very, very small amount of milk into the water. The tiny proteins and fats in the milk will scatter the light just like the oxygen in the atmosphere. Milk looks white in the bottle because the tremendous density of scattering particles scatters virtually all the light of every color - so we will add only a tiny amount - just a few drops and stir. The first thing you’ll notice is that the beam of light is now much more visible within the glass - the fats and proteins scatter some of this light so you can see it. If you slowly increase the milk concentration, the scattered light will become distinctly blue (when it is weak, it is already blue, but our eyes get better at seeing colors when things are more intense). Now, as the blue light is scattered the most and the red light is scattered the least, then the light coming out of the glass is a red/orange color - you can see this clearly on the screen behind the glass.

If you’ve been thinking as you’ve been looking at the screen behind your milky water, you might have realised that we have answered another question that comes up almost as often as the color fo the sky - The color of sunsets - Why are they red? When the sun is near the horizon, it has passed through a large distance of atmosphere. As it goes, the blue light scatters much more than the red light, so the light that makes it to you is much redder than basic sunlight.
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Old 10-14-2005, 08:23 AM
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thanks guys for your contributions that's what make this site interesting...

those are good ideas guys keep it up .
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Old 10-18-2005, 01:44 PM
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Post wow

wow... so many to choose from. i'll have to decide. thanx for your contributions.
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  #7  
Old 10-18-2005, 02:59 PM
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In my level, which is the 7th grade, we are expected to do things about cells, microorganisms, and things like that. We also are learning in our higher class how to make different experiments work. Mine is going to be seeing the reaction in soda when sugar is added. Some other ideas are giving various foods to a hamster when it has gone through a maze, or seeing if you can see how different places make the speed of evaporation increas/decrease. Good luck
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