Please, some sites that suggest science investigations?
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http://www.tryscience.org/\n\nhttp://scienceclub.org/kidproj1.html\n\nhttp://www.energyquest.ca.gov/projects/index.html\n\nhttp://pbskids.org/zoom/activities/sci/
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check these sites out
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Hope these sites help.
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Check out these sites.  They have  a lot of areas for you to explore.
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http://www.kids.gov/k_science.htm\nhttp://www.ala.org/gwstemplate.cfm?section=greatwebsites&template=/cfapps/gws/default.cfm\nhttp://www.hhmi.org/coolscience/\nhttp://www.kidsites.com/sites-edu/science.htm
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I know one website it is  howstuffworks.com  where you can get almost all information related science, engineering, & technology too. There are thausands of sites related to science while searching through Google you can get some more also.
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Science\nhttp://library.thinkquest.org/3750/index.html\nhttp://www.nationalgeographic.com/kids/\nhttp://www.state.sc.us/dmh/schoolbased/hurricane.htm\nhttp://www.scholastic.com/kids/weather/\nhttp://www.weatherwizkids.com/\nhttp://www.hhmi.org/coolscience/index.html\nhttp://www.exploratorium.edu/science_explorer/index.html\n\nSocial Studies\nhttp://www2.lhric.org/pocantico/election/election.htm\nhttp://www.fema.gov/kids/\nhttp://www.kids.gov/\nhttp://www.howstuffworks.com/\nhttp://www.peacecorp.gov/kids/difference/\nhttp://www.whitehouse.gov/kids/presidentsday/color/index.html\nhttp://teacher.scholastic.com/activities/election2004/\nhttp://www.socialstudiesforkids.com/\nhttp://www.timeforkids.com/TFK/\n\nMath\nhttp://www.aaamath.com/\nhttp://www.coolmath-games.com/\nhttp://math.rice.edu/~lanius/Lessons/\nhttp://www.superkids.com/aweb/tools/math/\nhttp://www.moneyfactory.gov/kids/start.html\n\nLanguage Arts\nhttp://www.scholastic.com/kids/\nhttp://www.seussville.com/\nhttp://www.kidsclick.org/\nhttp://www.enchantedlearning.com/Dictionary.html\nhttp://www.poetry4kids.com/index.php\n\nMisc.\nhttp://www.funschool.com/\n\nHope this helps
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Here are some sites to try///
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www.discovery.com \nSearch the word ´´Mythbusters`` they´ll give you some test and it´s totally FREE.
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This website is quite helpful:-\n\nhttp://www.sciencebuddies.org/\n\n\nThis website contains a few sample projects and related theory at different levels.
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http://www.all-science-fair-projects.com/
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You could try this site.
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http://www.discovery.com/\nThe Discovery Channel\n\nhttp://www.nasa.gov/\nNASA’s web page\n\nhttp://www.nytimes.com/learning/\nThis is the New York times on the web.  It’s for teachers, parents, and students who want to learn more about what is going on in the news.\n\nhttp://www.nws.noaa.gov/om/edures.htm\nThis site offers information for children, teens, and young adults.  Materials range from coloring books, puzzles and games, to lesson plans, brochures, satellite images, and career information for weather related fields, such as meteorology, hydrology and climatology.\n\n\nhttp://mapping.usgs.gov/www/html/1educate.html#packets\nOn this website you can find interesting and useful teaching packets, fact sheets, posters, booklets, leaflets, and brochures about geography and related sciences.  Resources are available through the Earth Science Information Center at 1-888-ASK-USGS (275-8747).\n\nhttp://www.education.noaa.gov/\nOn this website, you can access many educational activities, publications and booklets on the following topics: Satellites and space, oceans and coasts, climate change and our planet, and weather.
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www.livescience.com \n\nhttp://www.math.ru.nl/knopen/art_gallery.html\n\nhttp://www.themaninblue.com/experiment/SSCrabble/\n\nThese ones are good.
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heres some websites to look at...
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All of these seem to have good starts for ideas,\n\nhttp://yahooligans.yahoo.com/Science_and_Nature/Experiments_and_Activities/Science_Fairs/\nhttp://www.ipl.org/div/kidspace/projectguide/\nhttp://school.discovery.com/sciencefaircentral/\nhttp://www.scifair.org/\nhttp://www.cdli.ca/sciencefairs/\nhttp://www.isd77.k12.mn.us/resources/cf/ideas.html\nhttp://staff.washington.edu/chudler/fair.html
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http://www.factmonster.com/spot/sciproject2.html\n\nhttp://www.infoplease.com/spot/sciproject2.html\n\nhttp://parentingteens.about.com/cs/homeworkhelp/a/blscproindex.htm\n\nhttp://www.scienceproject.com/projects/index/elementary.asp\n\nThese sites have hundreds of ideas and instructions.