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TL;DR: Learn a little bit every day with a Four Minute Books lifetime subscription. As of Jan. 11, you can get access to hundreds of book summaries for only $39.99 — a 90% savings. We all want to boost our brains, but it’s hard to dedicate the time necessary to do so. Here's one way to learn a little every day. Four Minute Books summarizes hundreds of books, focusing on what it deems three most valuable points within each one. (Note: It is not a substitute for actually reading.) Its massive library of over 800 PDFs, 600 audiobooks, and comprehensive reading guides is a great opportunity to get acquainted with both new and classic nonfiction books alike. Read more...More about Books, Mashable Shopping, Culture, and Books