THE START. “Primed to carry out the requisite natural selections, Ray’s digital ecosphere was nearly complete. He called it Tierra (Spanish for “earth”) and started preparing the final touch: an inhabitant. Later dubbed “the Ancestor,” it was the first worm Tom Ray ever created – an 80-byte-long self-replicating machine written in Tierra’s quirky assembly language – and as it happens, it was also the last.”
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