The following are great places to browse if you're still looking for a topic.
If there's a specific field that interests you, do an Internet search for ideas--but remember to verify the information in credible sources to support the arguments in your paper.
National Science Foundation
Web site for government agency that funds science, engineering, education, and technology research that is non-medical. Browse the Discoveries by research area or do a search.
This online open access journal publishes "significant, original research that advances the frontiers of science." It is published by the American Association for the Advancement of Science, and in addition to being a great place to look for topics, this journal is peer-reviewed--so you can definitely use the articles you find in your research!
10 Recent Scientific Advances...
This site purports to be "the original Top 10 site" and will publish lists sent to them by readers. Use the ideas and pretty graphics for inspiration for a topic--but be sure to verify the information in credible, peer-reviewed sources!
These library databases are also good places to browse for topics.
You can also search in these multi-subject databases:
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