Science inquiry project
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The number of visible stars is the same whether it is overcast or not.  The question is whether we can see them from our particular vantage point.\n\nAnyways...\n\n\nIf the relative humidity is very high, then there is an excess of moisture in the air that particulate can stick to.\n\nLogic says yes, it would make it harder to see the stars.\nFOr instance, if you look toward the horizon, there is so much atmosphere that the views from this angle would be limited in quality.\n\nBut maybe on a clear night with high relative humitidy, looking straight up wouldn't effect the view too much.  Good question.  Another thought is, after it rains really good, and the clouds clear, the humidity would be high but particulate in the air at a minimum for a short while.  SO, maybe the viewing would be better at that point.
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I'm also doing an environmental project (school). I found lots of interesting stuff by asking the people around here. Try that but don't say it's your homework or something.
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http://school.discovery.com/sciencefaircentral/scifairstudio/ideas.html#weather\n\nThey have some wonderful ideas.  The interactive projects are always the funnest to do.  Stuff exploding.. messy...\n\nI found another the balloon and lemon one sounded cool.  http://www.science4mykid.com
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Try the discovery channel website
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Go to this website and it will give you the info you need!\n\nhttp://www.sciencebuddies.org/mentoring/project_ideas/Phys_p009.shtml?from=Home
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I am not really sure why but the guys on Myth Busters did this experiment on their show on the Discovery Channel. There is a little blurb here: http://dsc.discovery.com/fansites/mythbusters/episode/episode_02.html\nand more info on the experiment here:\nhttp://www.eepybird.com/science1.html\nhope that helps with your science fair project! good luck!
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http://www.freesciencefairproject.com/index.html\n\nBYE
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Try this...this may help you http://www.stevespanglerscience.com/
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Walk over to the science lab and ask one of the professors, or if you are a middle school student, ask one of the teachers.  I am assuming this is for a legal purpose of course.
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Resources for the student including tutorials, animations, project ideas, and sample quizzes.\n\nPhysics Classroom Projects\n\nThese projects were designed for my College Prep, Honors and  AP Physics B students\n\nAll Science Fair Projects Over 500 FREE Science Fair Project Ideas!
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The question is too open. What experiment are you talking about? If you google science supplies you might find out, although since it's homework most people won't just give you an answer.
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I think it sounds very interesting.  Have you thought about how you will test this question and then how you will present your findings?  Good luck to you!
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A classic, but great visual experiment is sucking a hard boiled egg into an erlenmyer flask.  It is done by using the principles of the kinetic theory of matter.  \nAnother cool project might be doing something with dry ice.  Find a place that you can get dry ice and do fun stuff with it, like create smoke, put bubble solution in water and then drop in dry ice to make bubbles that, when you pop, let out white smoke.\n\nAnother idea might be to do some cool colorful reactions.  Make some dye molecules or something.\n\nHope one of these ideas works for you.
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try www.sciencebuddies.org
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Here is a site that has alot of science experiments that work well with the elementary age group.\n\nhttp://pbskids.org/zoom/activities/sci/
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An easy one for the music topic would be to do it about how classical music affects the growth of plants or if it doesnt. For the dog topics it could be to reasearch about whether its true that their mouth is cleaner than the human mouth ( dont know why you would want to do that....but...anyways) . Another topic  saw once in a science fair was something with the simple atom. For the Atom one you can make an atom display and can explain about it and its importance and make a a poster about it too. Hope this gives you some ideas !! (seems easy ...na ? )
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i'M IN SIXTH GRADE, AND A GOOD SCIENCE FAIR TOPIC WOULD BE "WHICH SUBSTANCE CONDUCTS ELECTRICITY BEST". iT IS REALLY EASY TO DO AND YOU CAN HAVE LOTS OF GRAPHS. FOR EXAMPLE I HAVE 21 GRAPHS. AND MY WHOLE ENTIRE BOOK IS 93 PAGES LONG. \n\nHOPE i HELP YA!!