ABSTRACT
But thinking about the future, especially about ‘the next millennium’, is intimidating. In addition, progress is ‘discontinuous’. There are moments or periods of great discovery, of new and revolutionary conception, followed by long periods of stability; of verifying, quantifying, filling in and refining. There are also times of confusion and ferment, times when changes in facts, institutions, technology or beliefs show us that the old concepts are no longer valid but in which new concepts have yet to emerge. We live in such a time today.
