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71Vietnam — /vee et nahm , nam , vyet , vee it /, n. 1. Official name, Socialist Republic of Vietnam. a country in SE Asia, comprising the former states of Annam, Tonkin, and Cochin China: formerly part of French Indochina; divided into North Vietnam and… …
72Public-key cryptography — In an asymmetric key encryption scheme, anyone can encrypt messages using the public key, but only the holder of the paired private key can decrypt. Security depends on the secrecy of that private key …
73Cryptanalysis of the Enigma — enabled the western Allies in World War II to read substantial amounts of secret Morse coded radio communications of the Axis powers that had been enciphered using Enigma machines. This yielded military intelligence which, along with that from… …
74Human adaptation to space — Human physiological adaptation to space is a challenge faced in developing human spaceflight. The turn of the 21st century saw increased research into how humans can survive and work in space for long periods.Importance of subjectThe sum of… …
75Quaternary extinction event — Late Pleistocene landscape of northern Eurasia The Quaternary period saw the extinctions of numerous predominantly larger, especially megafaunal, species, many of which occurred during the transition from the Pleistocene to the Holocene epoch.… …
76angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction any member of the more than 300,000 species of flowering plants (division Anthophyta) …
77Islāmic world — Introduction prehistory and history of the Islamic community. Adherence to Islām is a global phenomenon: Muslims predominate in some 30 to 40 countries, from the Atlantic to the Pacific and along a belt that stretches across northern… …
78Southeast Asia, history of — Introduction history of the area from prehistoric times to the contemporary period. Early society and accomplishments Origins Knowledge of the early prehistory of Southeast Asia (Southeast Asia, history of) has undergone exceptionally …
79Elephant — Taxobox name = Elephant image width = 250px image caption = An African Bush Elephant near the border of the Serengeti and Ngorongoro Conservation Area in Tanzania. regnum = Animalia phylum = Chordata subphylum = Vertebrata classis = Mammalia ordo …
80animal behaviour — Introduction any activity of an intact organism. A living animal behaves constantly in order to survive, and all animals must solve the same basic problems. They must, for instance, periodically replace their energy source (consume… …
