An effort to reverse-engineer Holmes’s methodology into actionable insights that help develop “habits of thought that will allow you to engage mindfully with yourself and your world as a matter of course
You Are Not So Smart: Why You Have Too Many Friends on Facebook, Why Your Memory Is Mostly Fiction, and 46 Other Ways You’re Deluding Yourself — an illuminating and just the right magnitude of uncomfortable almanac of some of the most prevalent and enduring lies we tell ourselves. Source brain Pickings
Incognito a fascinating, dynamic, faceted look under the hood of the conscious mind to reveal the complex machinery of the subconscious. Equal parts entertaining and illuminating, the book’s case studies, examples, and insight are more than mere talking points to impressed at the next dinner party, poised instead to radically shift your understanding of the world, other people, and your own mind. Source brain Pickings
Good read. "This will make you Smarter" Essay's from scientists and others. Answering the question "What would you suggest we all add to our cognitive toolkit?" The answers are more engaging and inspiring than you might imagine. Check it out if you can.
After spending some time with Sagan, you may find Kant's argument against only thinking analytically rather refreshing. Your feelings and intuitions do matter (and in your 20s, you have a lot of them). He's a fan of a metaphysical understanding of the world and has some pretty good points to back it up.