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Exploring your topic and getting some background information at the start of a project can help you identify useful information (i.e. language used in a discipline, possible questions to be answered, timelines, etc.) and save you time.
Wikipedia is a good source for basic knowledge on a topic but cannot be used in the citations of a report. Look to the reference section of a Wikipedia article to find the original source of information.
Looking for more information on the Engineering Grand Challenges? Did you notice the "References" at the bottom of each topic page? This is a great starting place to understanding more about your topic.