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Computers are often used to put lists into some sort of order—for example, names into alphabetical order, appointments or e-mail by date, or items in numerical order.

In this activity, learners make their own encrypted code to pass along secret messages using a printable cipher wheel.

In this activity, learners construct three math puzzles out of simple materials like wood, string, and Styrofoam.

Even fast computers are limited to how quickly they can solve problems. One way to speed things up is to use several computers at once.