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Add Yahoo as a preferred source to see more of our stories on Google. Applied mathematicians use math to model real-world situations. Ariel Skelley/DigitalVision via Getty Images You can probably ...

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In spite of their name, “imaginary” numbers are as real as any other numbers, especially when it comes to hunting for lost treasure. For our first Insights puzzle of 2019, let’s go on a treasure hunt.

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Imagine winding the hour hand of a clock back from 3 o’clock to noon. Mathematicians have long known how to describe this rotation as a simple multiplication: A number representing the initial ...