Theory is good. Science that proves theory is where it’s at.
A couple of things most of us look for and what to read below:
Happiness.
For the science of happiness one can read: The How of Happiness by Sonja Lyubomirsky
Productivity.
For some science around productivity one can read: Smarter Faster Better by Charles Duhigg and Getting Things Done by David Allen
Organization.
For some science around organization (of the mind) one can read: The Organized Mind by Daniel Levitin