By definition, experiments yield uncertain results. It is because of the disappointments of the past that we feel so uncomfortable with uncertainty, and are so ready to declare the end of history. Crawling out of the cave is no easy task. And for some time, the intimation that real history is just about to begin is likely to inspire dread rather than enthusiasm.
But events like 11 September indicate that we cannot take time out indefinitely. In the end, purposeful human intervention and experimentation is the only realistic option. Taking such risks is an obligation that our nature as humans imposes on us.
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