11 Books by Yakov Perelman (in Spanish) (librosmaravillosos.com)

If you've never read his books (esp. "Physics for Entertainment") in high school , then you really did not have fun with Physics.

His math books:

1. Mathematics Can Be Fun 2. Figures for Fun 3. Arithmetic for entertainment 4. Geometry for Entertainment 5. Lively Mathematics 6. Fun with Maths & Physics

His physics books:

1. Physics for Entertainment (1913) 2. Physics Everywhere 3. Mechanics for entertainment 4. Astronomy for entertainment 5. Tricks and Amusements

Free electronic edition of "Physics for Entertainment" @ Internet Archive. http://www.archive.org/details/physicsforentert035428mbp

A whole generation of Indian geeks grew up on his books, particularly the superb "Mathematics Can Be Fun". It's a real shame Mir publishers died :(