per-săpĭens
21Sub-Saharan Africa — Black Africa redirects here. For the Namibian football team, see Black Africa F.C.. Definition of Sub Saharan Africa as used in the statistics of the UN institutions. However, Sudan and South Sudan is classified as North Africa by the United… …
22Greenhouse gas — Simple diagram of greenhouse effect. A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.[1] …
23Race (classification of humans) — Race Classification Race (classification of humans) Genetics …
24Vitamin C — This article is about ascorbic acid as a nutrient; for its chemical properties, see the article ascorbic acid; for other uses, see the disambiguation page. Vitamin C …
25nature, philosophy of — Introduction the discipline that investigates substantive issues regarding the actual features of nature as a reality. The discussion here is divided into two parts: the philosophy of physics and the philosophy of biology. In this… …
26Histoire de l'Éthiopie — L Éthiopie se trouve aussi au cœur de l histoire de l humanité[1]. Le pays abrite les restes des plus anciens hominidés connus (entre autres, Dinknesh (ድንቅ ነሽ), appelée généralement « Lucy », âgée de 3,18 millions d années, et… …
27anthropology — anthropological /an threuh peuh loj i keuhl/, anthropologic, adj. anthropologically, adv. /an threuh pol euh jee/, n. 1. the science that deals with the origins, physical and cultural development, biological characteristics, and social customs… …
28Air pollution — from World War II production Smog over …
29birth control — regulation of the number of children born through the deliberate control or prevention of conception. Cf. family planning (def. 1). [1914, Amer.] * * * Voluntary limiting of human reproduction, using such means as contraception, sexual abstinence …
30Wicked Wanda — Oh, Wicked Wanda! Wicked Wanda on cover of Penthouse by Ron Embleton Publication information Publisher Penthouse …
