Images Dated 21st April 2005

Title pages of Pacciolis Summa de Arithmetica

^BMathematics book.^b Title page of a medieval book on mathematics. Image taken from the 1523 edition of ^ISumma de Arithmetica, geometria, proportioni et ^Iproportionalita.^i This book was first published in 1494 by the Italian mathematician Paccioli (1445-1510), who was also known as Luca de Borgo. The ^ISumma ^iincluded many algebraic and geometrical developments and solutions. Paccioli had learnt much of the knowledge in the book whilst travelling in the Middle East at a time when the Arabs were more scientifically advanced than Europeans

© JEAN-LOUP CHARMET/SCIENCE PHOTO LIBRARY

Tourists walk on a part of the Huanghuacheng section of Chinas Great Wall which was recently

Tourists walk on a part of the Huanghuacheng section of China's Great Wall which was recently renovated northwest of Chengguan town. Tourists walk on a part of the Huanghuacheng section of China's Great Wall which was recently renovated northwest of Chengguan town April 21, 2005. Beijing began Tuesday a second phase of a project to repair a 12.4 kilometres (7.7 miles) section of the Great Wall in a suburban area, the municipal government announced. At a cost of 12 million yuan ($1.45 million), the whole project will cover rebuilding of 13 towers, two gates, 3,300 meters of wall and other facilities on a four-kilometer stretch of the Huanghuacheng section. The total area of the repair of buildings totals 18,870 square metres (203, 115 square feet), Xinhua newsagency reported. REUTERS/Jason Lee - RP6DRMVHRDAB

Red Fox, Vulpes vulpes, Brown Bear, Ursus Arctos, Alaska Penensila, Alaska, Red Fox

Red Fox, Vulpes vulpes, Brown Bear, Ursus Arctos, Alaska Penensila, Alaska, Red Fox and brown bear cub

© Dee Ann Pederson / DanitaDelimont.com

Alaska, Alaska Peninsula, Animal, Beach, Bear, Brown Bear, Cub, Danita Delimont, Dee Ann Pederson, Depth Of Field, Fauna, Fox, Habitat, North America, Red Fox, Sit, Ursus Arctos, Usa, Vulpes Vulpes, Wildlife