Encyclopedias are a good place to look for introductory information on almost any science topic.
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The first 2 links below are basic indexes that would be a good starting place for a beginning-level paper related to any area of science. Most of the articles in these 2 databases are available full-text. The ISU Library also has MANY additional indexes to journal articles in a wide variety of scientific disciplines. Click on the Find Articles tab to locate additional recommended indexes.
Need help picking a topic for your paper? Here are some ways to locate hot topics in science: