Good points. I am in India. When in college, used to buy and read those books, for math., physics, etc. Good content. I remember Ya. Perelman's [1] books in par

Good points. I am in India. When in college, used to buy and read those books, for math., physics, etc. Good content. I remember Ya. Perelman's [1] books in particular, for popularizing physics to the layman. Stuff about perpetual motion machines (explaining why they cannot work), physical phenomena related to refraction, reflection, etc., and much else besides. [1] https://en.wikipedia.org/wiki/Yakov_Perelman https://en.wikipedia.org/wiki/Yakov_Perelman