What is the best way to use a natural resource that seems inexhaustible but is not? There is a vast range between profligacy and austerity, but conservation is perhaps the key word. In this context, as one compares the approach to water use in California’s Santa Clara (Silicon) Valley and in Delhi, one realises that God made man equal, but science, education, and the ability to organise society made him rapidly unequal. While speculating about the future, war-aficionados and writers o