can suggest new technologies as well, and hence any discussion of the future of engineering must ponder scientific breakthroughs that might occur along the way.

In his groundbreaking book The Structure of Scientific Revolutions, Thomas Kuhn (1970) helped us see that science advances through two quite different dynamics. Ordinary science fills in the details of a landscape that is largely known. Every once in a while the problems of the contemporary world view become so unworkable that reinventing the map is needed. For example, the recognition that continents moved slowly over the surface of the earth solved many problems that a model of a static planet made unsolvable. This recognition led to a reconceptualization and new perception of reality.

One of the questions our view of the world answers is how things are connected and put together. The familiar model is a building constructed of diverse components assembled in a fixed pattern. The other familiar model is a fluid, like a river, with a rapidly changing shape formed by local conditions. An emerging model of order is the network. In a universe of superstrings and soft boundaries for molecules, network-like connections among things may provide a useful new ordering principle. Networks have unique properties, such as self-organization, and sometimes huge multiplier effects of many connecting to many. Networks also have vulnerabilities, as demonstrated by the blackout in the northeastern United States in August 2003.

We are also seeing a new relationship between the macroscopic world we inhabit every day and the microscopic world at a molecular, atomic, and even subatomic level. Once we could describe events in our observable world by fairly simple mathematical rules, say the trajectory of a baseball hit out of a baseball park, but the very small was imprecise, uncertain, and statistical. Now new tools and mathematics enable us to enjoy a similar level of precision, certainty, and uniqueness even at the smallest imaginable scales. We have, for example, recently discovered how to encode data in the spin of an electron inside an atom—in other words, subatomic data storage (Awschalom et al., 2002).

Both the exquisite sensitivity of biological function to the precise sequencing of base pairs of DNA and the mathematics of chaos lead to a view that small actions matter in giving form to things and order to events. What we do actually matters to history. The future really is the result of choices made today. It is not merely the random concatenation of mechanically predetermined events or the statistical result of acci-



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement