What are you interested in ?

Some suggestions :

Stuff Matters: Exploring the Marvelous Materials That Shape Our Man-Made World it's a book about the materials around us : glass, paper, chocolate, concrete, porcelin, graphene, etc. It shows the history of the material, how, what and why it is the way it is. It's a short great read and gives you a new perspective of the world around you.

Surely You're Joking, Mr. Feynman! Some stories about the life of Richard Feynman, which was a nobel prize in physics but also a painter, lover, pick-locker, musical instrument player among other things. It shows how to think like a scientist and what it is and what it means to be scientific.

Born to run, Superintelligence, The Black Swan (Nassim Nicholas Taleb), Thinking Fast and Slow, Nicomachean Ethics, The Martian, The Rosie Project are some suggestions among different topics.

You can search at http://gen.lib.rus.ec/ for free ebooks, they have over 30 millions ebooks. You can use the software 'Calibre' to create and organize your Ebook Library.