Topic: How important are the opinions of experts in the search for knowledge?
Opinion: The opinions of experts in the search for knowledge are very important because how can we believe that something is true without a reliable source such as the opinion of an expert.
Albert Einstein's opinion is worth a lot in the world of mathematics. By reading this quote people are more likely to believe it becomes it comes from a recognised expert such as Albert Einstein.
Al Gore is known as an expert in global warming due to his documentary "An Inconvenient Truth". When people are researching this controversial topic they might research on Al Gore because his opinion really matter in that particular subject.