Where can i find some help building a simple compound machine online that will pop a balloon when complete?
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put a pin through a popcicle stick and set it up like a see saw, so that when the ball hits it, the pin will poke the baloon.
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Search on the Internet for a book and a supply of special balloons that you can order. The Qualatex company makes balloons for making animals.\n\nYou will also need a special pump to inflate the balloons, unless you have super-powerful lungs. (I can blow one up if I really, really work at it, but it's not worth it. Buy the pump. The best kind of pump is a small one with a bulb that you squeeze. A cheaper, less satisfactory pump requires you to hold it in both hands and push it in and out.)\n\nGood luck to you! Kids love it when you make balloons for them.
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http://www.websudoku.com/\n\nThere is a print option below the puzzle.
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Listed below is a site that looks interesting. There are 7 machines built of popscicle sticks and links to more machines of various size.
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here\nscholastic.com\nsearch engines
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http://www.digitaljuice.com/\n\nhttp://www.tutorialkit.com/
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http://www.projectseven.com/\nhttp://www.fourlevel.com/extensions.htm
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http://www.psadna.com/ball/ballprocess.chtml
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What type of balloons? For balloon designing? balloon twisting? balloon selling?\n\nNot that I know of any but am interested in balloon twisting and will follow this question if that is the info you are seeking...
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http://www.projectw.org\n\nhttp://spazcreations.com/
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Go to Micro soft, type in power toys, and look for Calc plus. it is free!
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I just helped my daughter with her science project. We made an electromagnet. Very easy to build and you can get buzzers, lights, and battery holders a your nearest hobby Lobby. you can also get toggle switches at the local hardware store. Mount it all on a nice piece of wood and your in business. by the way, my daughter took home first place!
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That's not going to be an easy task.\nIt's not usually done.\n\nEbay has soldering tools, even SMT ones.
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Here's a site with alot of different ideas and difficulty levels with instructions.  Maybe you can find something here.\n\nOr you can tell us more about what you are wanting to do and what you like and we might be more helpful on here.\n\nhttp://www.all-science-fair-projects.com/
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http://www.all-science-fair-projects.com/\nhttp://www.makezine.com/
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try this :\n\nhttp://www.makezine.com/blog/archive/2005/06/
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There a many commercially availible coin counters out there, check your favorite search engine (or old school phonebook!).  \n\nIf all you want is the sensor I recomend contacting a vending machine supply/repair company for one.\n\nIf you want to make your own from scratch, just use a laser and a photo-detecter.  Have the laser hitting the photodectector and wire your electronics to count up the interuptions of the detector.