Theories in psychology?

For my (8th gr.)English class I have to write an 8-12 pg research paper on anything as long as I can find 5-10 sources and enough information to write 8 pages. I would like to write about a psychology theory like why people react this way when something happens or why certain people are seen this way. The problem... show more For my (8th gr.)English class I have to write an 8-12 pg research paper on anything as long as I can find 5-10 sources and enough information to write 8 pages. I would like to write about a psychology theory like why people react this way when something happens or why certain people are seen this way. The problem is I don't know any psychology theories. Suggestions, please???
Thanks :)
(if there's a website or book that talks about the theory,that information would be much appreciated)
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