"How essential it is in youth to acquire some intellectual or artistic tastes, in order to furnish the mind, to be able to live inside a mind with attractive and interesting pictures on the walls."

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It's worth remembering that all technology leaves a footprint. For example, our own technology is leaving a footprint in terms of global warming, which could be detected from a long way away. One assumes that a very advanced civilization that has been around maybe millions and millions of years would have an even bigger footprint that might extend beyond its planet to its immediate astronomical environment.

— Paul Davies