Does anyone remember there were two Physics related books, and a maths fun fact book translated from Russian. These books contained short Physics & Maths related fun facts and short quizzes etc.
The author was Y Perelman - Yakov Perelman. His son is this mathematician Grigori Perelman.
I wrote on a previous thread about the above and one member replied that the maths book was named 'Ganitha Vinodaya".