A clear and simple introduction to fractals, with many examples and some discussion of the principles behind fractals. (
http://math.rice.edu/~lanius/frac/
)
Visit The Inventor’s Toolbox to learn about simple machines and many kinds of gears. Illustrations are included, and a link takes you to the Gadget Anatomy page, showing how simple machines are used in some common devices. (
http://www.mos.org/sln/Leonardo/InventorsToolbox.html
)
Use the table of contents to learn how a bicycle’s components work together to get you where you want to go. (
http://travel.howstuffworks.com/bicycle.htm
)