we lag behind in space exploration
41building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
421973 oil crisis — Further information: 1973 world oil market chronology 1973 Oil Crisis Other names Arab Oil Embargo The 1973 oil crisis started in October 1973, when the members of Organization of Arab Petroleum Exporting Countries or the OAPEC (consisting of the …
43The Chanur novels — The Chanur Saga omnibus The Pride of Chanur Chanur s Venture The Kif Strike Back Chanur s Homecoming Chanur s Legacy Author …
44electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …
45Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
46digestive system disease — Introduction any of the diseases that affect the human digestive tract. Such disorders may affect the esophagus, stomach, small intestine, large intestine (colon), pancreas, liver, or biliary tract. A prevalent disorder of the digestive… …
47Hubbert peak theory — Hubbert peak redirects here. For the episode of The West Wing, see The Hubbert Peak. M. King Hubbert s original 1956 prediction of world petroleum production rates …
48History of economic thought — The history of economic thought deals with different thinkers and theories in the field of political economy and economics from the ancient world to the present day. British philosopher Adam Smith is cited by many as the father of modern… …
49Orbit — This article is about orbits in celestial mechanics, due to gravity. For other uses, see Orbit (disambiguation). A satellite orbiting the Earth has a tangential velocity and an inward acceleration …
50The Parafaith War — (1996) is a science fiction novel by L. E. Modesitt, Jr.. It is set in a future where humanity has spread to the stars and divided into several factions. Two factions, the Eco Tech Coalition and the Revenants of the Prophet ( revs ) are engaged… …
