Paulo Ribenboim treats numbers in this extraordinary collection of overview articles as if they were his personal friends. In a light and generally accessible language, he discusses prime numbers, Fibonacci numbers, the North Polar Sea, the classical works of Gauss on binary quadratic forms, Euler's famous prime-generating polynomial, as well as irrational and transcendental numbers. Following the great success of "The World of Prime Numbers," this is Paulo Ribenboim's second book to be published in German.