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Sahel

(Encyclopedia)Sahel sähĕlˈ [key], name applied to the semiarid region of Africa between the Sahara to the north and the savannas to the south, extending from Senegal and Mauritania on the west, through Mali, N B...

Laski, John

(Encyclopedia)Laski, John yän lăsˈkē [key], Latin Johannes Alasco, 1499–1560, Polish Protestant reformer. A learned priest, he went in 1523 to Basel, where he was a close friend of Erasmus. After returning to...

Breitenfeld

(Encyclopedia)Breitenfeld brīˈtənfĕltˌ [key], village, Saxony, S central E Germany. It gave its name to two battles of the Thirty Years War. Gustavus Adolphus (Gustavus II) of Sweden there defeated the imperia...

Roscelin

(Encyclopedia)Roscelin rŏsˈəlĭn [key], c.1045–c.1120, French scholastic philosopher, also called Roscellinus, Johannes Roscellinus, and Jean Roscelin. Roscelin was one of the first thinkers of the Middle Ages...

Sunita, Narain

(Encyclopedia)Sunita, Narain, 1961–, Indian writer and environmentalist, b. New Delhi, India, graduated from University of Delhi, honorary degrees from Cranfield ...

erosion

(Encyclopedia)erosion ĭrōˈzhən [key], general term for the processes by which the surface of the earth is constantly being worn away. The principal agents are gravity, running water, near-shore waves, ice (most...

carbon dioxide

(Encyclopedia)carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure. It does not bur...

Tübingen

(Encyclopedia)Tübingen tüˈbĭng–ən [key], city (1994 pop. 83,553), Baden-Württemberg, SW Germany, on the Neckar River. It is a cultural and industrial center; manufactures include textiles, machinery, metal ...

Bürgi, Joost

(Encyclopedia)Bürgi, Joost or Jost, 1552–1632, Swiss mathematician and instrument maker. As the official clockmaker (1579–92) to Duke Wilhelm IV of Hesse-Kassell, he developed the first clock with a minute han...

Regiomontanus

(Encyclopedia)Regiomontanus rēˌjēōmŏnˌtāˈnəs [key] [Lat.,=belonging to the royal mountain, i.e., to Königsberg], 1436–76, German astronomer and mathematician, b. Königsberg. His original name was Johan...