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Alex Honnold didn’t scale El Capitan with a wandering mind. The feats of this prolific free soloist call for incredible focus and an all-consuming approach to training and preparation that might leave you wondering whether Honnold has a mind for anything but climbing. But he’s is actually an . Here are four books that he highly recommends.

‘Homo Deus: A Brief History of Tomorrow’ by Yuval Noah Harari 

“I just started  book. I almost didn’t put it in my travel bag because it’s so heavy, but I think it will be worth the read. I also really enjoyed  by the same author.”

‘The New Jim Crow: Mass Incarceration in the Age of Colorblindness’ by Michelle Alexander

“ was given to me by Dory Trimble, executive director of , who wanted to educate me about social justice. A super-heavy read, but it definitely changed the way I see the entire criminal-justice system. I would consider this a must-read for anybody.”

‘Off Grid Solar: A Handbook for Photovoltaics with Lead-Acid or Lithium-Ion Batteries’ by Joseph P. O’Connor

“This was also given to me by Dory—and it was given to her at an event by the author, who hoped to help educate me on solar. Fittingly, I’d been struggling with the solar system on my van, and  helped me better understand the whole system.”

‘N�ǰ��ٳ�:��Finding My Way While Running the Appalachian Trail’ by Scott Jurek

“I got  from Scott and lagged on reading it for a while because I felt I already knew how it ended. But when I finally sat down and read it, I really enjoyed his entire journey. I found it surprisingly inspiring.”