There's an interesting book about Fourier and his series and transform written for a general audience: "Who Is Fourier? A Mathematical Adventure" [1], by an organization called the Transnational College of LEX (which seems to have some sort of connection with Hippo Family Club[2]).

The only math assumed going in is basic high school algebra.

They also have a book on quantum mechanics ("What is Quantum Mechanics? A Physics Adventure" [3]) and biology ("What is DNA? A Biology Adventure"[4]).

[1] https://www.amazon.com/Who-Fourier-Mathematical-Adventure-2n...

[2] https://en.wikipedia.org/wiki/Hippo_Family_Club#Transnationa...

[3] https://www.amazon.com/What-Quantum-Mechanics-Physics-Advent...

[4] https://www.amazon.com/What-Biology-Adventure-Transnational-...

Also the LEX series, like https://amazon.com/What-Quantum-Mechanics-Physics-Adventure/...