epoch of scientific discoveries
71Global cooling — in general can refer to an overall cooling of the Earth. In this article it refers primarily to a conjecture during the 1970s of imminent cooling of the Earth s surface and atmosphere along with a posited commencement of glaciation. This… …
72Western architecture — Introduction history of Western architecture from prehistoric Mediterranean cultures to the present. The history of Western architecture is marked by a series of new solutions to structural problems. During the period from the… …
73Egypt, ancient — Introduction civilization in northeastern Africa dating from the 3rd millennium BC. Its many achievements, preserved in its art and monuments, hold a fascination that continues to grow as archaeological finds expose its secrets. This article… …
74Fossil — For other uses, see Fossil (disambiguation). Three small ammonite fossils, each approximately 1.5 cm across …
75Martin Behaim — Behaim redirects here. For the lunar crater, see Behaim (crater). Martin Behaim. Engraving from Narrative and critical history of America, Volume 2 by Justin Winsor Martin (von) Behaim (6 October 6, 1459 – 29 July 1507), (also known as Martinho… …
76History of calculus — History of science …
77History of South Georgia and the South Sandwich Islands — The history of the South Georgia and the South Sandwich Islands is relatively recent. When European explorers found the islands, they were uninhabited, and their hostile climate, mountainous terrain, and remoteness made subsequent settlement… …
78South Africa — Republic of, a country in S Africa; member of the Commonwealth of Nations until 1961. 42,327,458; 472,000 sq. mi. (1,222,480 sq. km). Capitals: Pretoria and Cape Town. Formerly, Union of South Africa. * * * South Africa Introduction South Africa… …
79Angelo Secchi — Angelo Secchi † Catholic Encyclopedia ► Angelo Secchi Astronomer, b. at Reggio in Emilia, Italy, 18 June, 1818; d. 26 Feb., 1878. He was the son of a joiner, Antonio Secchi. His mother (née Luise Belgieri), a practical middle class… …
80Atom — The atom is the smallest unit of an element that retains the chemical properties of that element. An atom has an electron cloud consisting of negatively charged electrons surrounding a dense nucleus. The nucleus contains positively charged… …
