If I want to learn something new that is technical or in a specific science, I will look to a college for classes (expensive, if it's not community college) or ask people in the field for suggestions regarding good books, online programs, interactive learning software, etc.
For "current events" type learning, I stick with NPR and the internet. Literature? Hit up a library or a thrift store for books. History? Same deal. Archaeology? Talk to people in the field, read journal articles, etc.
The best way to stay informed regarding a specific scientific field is to subscribe to the major journals in that field, which can be expensive unless you can find library access to them somewhere (usually through a university). You'll stay on the cutting edge of research in the field, as well as get a good overall picture of what has been done over the last few decades. If you have a specific topic (perhaps mentioned in a journal article) you want to learn more about, go to the references mentioned in the article through a library - you're bound to find some older books in the bibliography that will give you a good overall picture of what they're doing.
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"Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark."
— Henri-Frédéric Amiel
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