Not really a book that has lectures but it's a great book that covers all popular topics in Mathematics (fun to read).
(Link: https://mirtitles.org/2015/12/07/mathematics-can-be-fun-yako...)
Some of his Books;
* Physics for Entertainment Vols I & II
* Algebra for Fun
* Figures for Fun
Some of his Books;
* Physics for Entertainment Vols I & II
* Algebra for Fun
* Figures for Fun