Kosko, Bart: "Fuzzy Thinking". Hyperion, 1993.
A great book, starting from a philosophical point of view and going into all the different sciences.
Kosko, Bart: "Heaven in a Chip". Three Rivers Press, 1999.
How would our world look if fuzzy thinking was more spread in our daily life. Not so easy to read, but it gives you a lot to think about. The mathematical parts are in the back of the book and are not important to understand his ideas.
Mukaidono, Masao: "Fuzzy Logic for Beginners". Singapore: World Scientific, 2001.
The title speaks for itself. A good start, but not very exciting.
Gay, David: "Geometry by Discovery". University of Arizona, 1999.
A great book which makes you discover geometry by yourself. It helps you acquire techniques to solve a problem by simpifying it and then going on step by step until you are at the original problem.
Dunham, Wiliam:"The Mathematical Universe". John Wiley & Sons, Inc 1994.
Hibner Koblitz, Ann: "A convergence of lives: Sofia Kovalevskaia: Scientist-Writer-Revolutionary". Birkhäuser, 1983.
The Art of Renaissance Science: Galileo and Perspective www.crs4.it/Ars/arshtml/arstoc.html
Well written and informative page with good examples of Renaissance paintings.
Biography with lots of pictures.
If you want to know more about Newtons life and works.
About the Pythagorean triplets.
Very good gallery:
Guide on Mandelbrot Set:
Encyclopaedia about Mandelbrot Set: