Alien can Computer Science
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Computers are useful in that they're able to work through a large amount of information. They can sort large groups of items alphabetically or numerically. They can also go through lists of items and find specific items. Figuring out how computers are able to do such things is part of what Computer Science is about.

For more information:

Computer Science Department of Carleton College More Searching and Sorting Algorithms

Disclaimer: Alien is a mere computer science student and not an expert on this subject.