Currently: Ten Keys to Reality - “popularized” advanced physics by Nobel laureate Frank Wilczek - (asymptotic freedom as it relates to the strong nuclear force ).
I wish any of this would help me make my plants look better! 🙂
Generally Recommended: How the World Really Works by Vaclav Smil.
More hardcore: The Theoretical Minimum by Leonard Susskind.
And when I am lost there is always - in no particular order - François Voltaire, Isaac Newton, Soren Kierkegaard, Richard Feynman, Jack Daniels, Blaise Pascal, the Bhagavad-Gita. Yes, and the Bible! And of others…
Cheers,
Michael