Start with high-confidence mathematics books, then narrow by subgenre or adjacent topics.
Secrets of Mental Math
Arthur Benjamin, Michael Shermer
One Two Three . . . Infinity
George Gamow
The Equations World
Boris Pritsker
The Joy of X
Steven Strogatz
Ones and Zeros
John R. Gregg
One, Two, Three
David Berlinski
The Indisputable Existence of Santa Claus
Thomas Oléron Evans, Hannah Fry
Math Without Numbers
Milo Beckman
