Discuss society's tendency to fear the unknown.
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.
I searched Google under the key words "fear of unknown" to get these possible sources:
http://www.google.com/search?client=safari&rls=en&q=fear+of+unknown&ie=UTF-8&oe=UTF-8
Be sure to express the ideas presented in your own words.
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.