The technological trajectory traversed in communications and transport from pigeon mail and pony express to e-mail and videoconferencing is almost as great as the intellectual space between Noah's Ark and the biotechnological revolution in the preservation and improvement of the species. Dreams are multi-hued today and soar beyond the hitherto accepted bounds of human endeavor.

The first bimolecular motors with tiny metal propellers to reach inside our cells and probe their secrets have been built and pilot-tested and scalpels fitted with probes that can instantly reveal whether cells are cancerous may soon help surgeons operating on tumours to detect cancer at the earliest stages, perhaps even replacing biopsies. That Einstein ousted Gandhi as Time's Man of the Century clearly reflects the Zeitgeist. As Stephen Hawking writes, The world has changed far more in the last 100 years than in any other century in history. The reason is not political or economic, but technological - technologies that flowed directly from advances in basic science.

The reflection of the Zeitgeist, even as it stands witness to the enormity of man's reach, is also a warning: that when man's reach exceeds his grasp, it is time to pause and ponder over priorities. From time to time, a natural disaster might push us back to oil lamps and cooking by wood fire but a baby born a whole hundred hours after the mother was trapped under heavy rubble will also establish the sovereignty of other forces. Baby buying on the Internet illustrates the lowest human motivations at work, but harnessing its reach to attract global aid for earthquake victims reflects higher human impulsions.