World Wide Science is an online portal that lets you search millions of academic papers and journal articles that cover subjects such as IT, medicine, physics, chemistry and lots more. If you want in-depth knowledge about a particular topic, this is the place to find it.
Although not all referenced articles are freely downloadable as full text (sometimes you have to pay if you want to read anything except the summary), there are still loads of full articles to read. The availability of a full downloadable copy is clearly indicated in the search results.
So to broaden your knowledge, head to www.worldwidescience.org and get searching.
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