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"All operating systems know when they were born. Their internal clocks start counting then, so they can calculate the date and time in the future. It is unclear whether it was Mr Ritchie or Mr Thompson who set the so-called start Unix time at January 1st, 1970. That moment came to be known as the epoch. Mr Ritchie helped bring it about. And with it, he ushered in a new era." Which is as poetic a way as any of expressing how deeply rooted K&R are in the modern world.