Observation programmes are finding more and more asteroids and comets, but most are too small or far away to pose much danger. Yet the scientific metaphor of self, inherited from the Enlightenment, comes at a price: it entails an understanding of higher levels of organization by appealing to the behaviour of constituent lower elements. These days, specialist science correspondents are an endangered species. PSI, in fact, is not much of a commercial operation. Zacharias says the last time his company sold a commercial product was in the s, when a website personalization tool it developed was sold to another company that in turn sold it to the software developer Adobe.
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