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Science is manmade and man is of nature.

It's true that most programmers do not do computer science but CS as a science does exist. CS is the study of data structures and algorithms. CS can be viewed as a branch of mathematics but it is much more process oriented than most math disciplines.

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If aliens ever land they're going to have the exact same sorting algorithms we have. Their history of CPUs will be the same as ours.

Unless they chose the ternary path. It’s closer to base e and therefore closer to optimal than binary.

Unless they have quantum computers or something completely different that we have not thought of. There's a good chance that our conception of computer science, or even science for that mater, is completely unique in the universe, like a snowflake. Science is merely a model humans use to understand the world around them, with limited success.

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