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Active Directory Cookbook by Robbie Allen

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Our look is the result of reader comments, our own experimentation, and feedback from distribution channels. Distinctive covers complement our distinctive approach to technical topics, breathing personality and life into potentially dry subjects.

The animal on the cover of Active Directory Cookbook is a bluefin tuna (Thunnus thynnus), also known as a horse mackerel. It inhabits both the Atlantic and Pacific Oceans in temperate and subtropical waters. The body of a bluefin tuna is a metallic, deep blue on top, while the undersides and belly are silvery white. The first dorsal fin is yellow or blue; the second is red or brown. The rear fin and finlets are yellow, edged with black. The central caudal keel is black.

The bluefin tuna is one of the largest and fastest species of marine fish. An adult can weigh as much as 1,500 pounds (680 kilograms), and can swim up to speeds of 55 miles per hour (88.5 kilometers per hour). A bluefin tuna can swim across the Atlantic Ocean in 40 days. Recent pop-up satellite tracking has revealed that the bluefin tuna can dive to depths greater than 3,000 feet in a matter of minutes and still maintain a body temperature of 77 degrees Fahrenheit (25 degrees Celsius), even in near-freezing water.

Commercial fishing has reduced the stock of bluefin tuna to the extent that a single fish, once caught, can be worth up to $40,000 (U.S.). However, the situation is reversible, and the numbers of tuna could increase if the guidelines of the International ...

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