Imaginary numbers can seem confusing at first, but they play a powerful role in mathematics and real-world applications. This guide explains what imaginary numbers are, why they exist, and how they ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. A Social Security number (SSN) is a numerical ID for U.S. citizens and residents to track ...

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BUY THIS BOOK The Book of Imaginary Beings Jorge Luis Borges, with Margarita Guerrero, trans. from the Spanish by Andrew Hurley, illus. by Pe. Penguin, $25.95 (236pp) ISBN 978-0-670-89180-1 ...