A science project that has variables can be an experiment that aquires for variable change.
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The number of dependent variables in an experiment varies, but there is often more than one. experiments also have controlled variables are quantities that a scientist wants to remain constant, and he must be observe them as carefully as the dependent variables.
Check out http://www.sciencebob.com/experiments/index.php for some ideas. There are tons of experiments listed, you should be able to find something fun.
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Some science experiments involve substances that would be dangerous to get in your eyes.
another word for variables are 'things'.