Legal
Patents
I know what you're thinking: "Patents are boring, I don't want to do a presentation on that." But stop and think a minute. Patents are written, legally-binding records of a person's genius. With a patent, you can actually own an idea. Intellectual property rights allow computers to become faster, cars to become safer, and people to become rich.
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USPTO General Information - From the United States Patent and Trademark Office.
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How Patents Work - Great article on what they are, what they do, and how much they cost.
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Wikipedia Entry - Article about patents from all over the world.