Some years—1789, 1929, 1989—change the world suddenly. Or do they? In 2020, a pandemic converged with an economic collapse, inequalities exploded, and institutions weakened. Yet these crises sprang not from new risks but from known dangers. The world—like many patients—met 2020 with a host of preexisting conditions, which together tilted the odds toward disaster. Perhaps 2020 wasn’t the year the world changed; perhaps it was simply the moment the world finally understood its deadly diagnos...

&>Introducing Routing and Switching in the Enterprise, CCNA Discovery Learning Guide is the official supplemental textbook for the Introducing Routing and Switching in the Enterprise course in the Cisco® Networking Academy® CCNA® Discovery curriculum version 4. The course, the third of four in the new curriculum, familiarizes you with the equipment applications and protocols installed in enterprise networks, with a focus on switched networks, IP Telephony requirements, and...

This open access book presents a thorough look at tortuosity and microstructure effects in porous materials. The book delivers a comprehensive review of the subject, summarizing all key results in the field with respect to the underlying theories, empirical data available in the literature, modern methodologies and calculation approaches, and quantitative relationships between microscopic and macroscopic properties. It thoroughly discusses up to 20 different types of tortuosity and introdu...