One of the marvels of technology is the Hamilton Beach blender. Unlike so many gizmos, the design of its basic components does not change from year to year. Go to your local hardware store and you can find blades for a 30-year-old model. Here we see the old blades on the left and the new on the right. For more information on this champion of design consistency, visit www.hamiltonbeach.com.

Another example of a stable design is Adobe Postscript. This software has evolved over the years, yet fonts and EPS graphics generated twenty years ago still work in today's computers. Before the invention of Postscript, every time a new typesetting machine was invented, new fonts had to be invented as well. If you purchased new equipment, you purchased new fonts. Twenty-five font familes could cost ten thousand dollars!

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