Actively maintain non-stop curiosity about everything and Train yourself to quickly grasp the "kernel" in any subject i.e. learn to identify the "heart of the matter". When it comes to learning there are no time constraints, no competition and nothing matters outside of "grokking it" to your own standards.
Do lots of Internet research, Identify offbeat subjects/people, Browse bookstores and keep buying Books :-)
Always be on the lookout for something different from the commonplace and the norm. Generally, the "populace" only looks at the obvious, popular and the lowest common denominator. Hence identify people/books who are contrarians, look into nooks and crannies of various subjects and try and understand their viewpoints. Breadth of mind and a willingness to give-up cherished beliefs when proven wrong are a must.