Engineering must welcome women or risk becoming marginalized as other fields seek out and make a place for them. by Sheila E. Widnall Sheila Widnall is the former Secretary of the Air…
(Encyclopedia) cryptographycryptographykrĭptŏgˈrəfē [key] [Gr.,=hidden writing], science of secret writing. There are many devices by which a message can be concealed from the casual reader, e.g.,…
(Encyclopedia) American Medical Association (AMA), professional physicians' organization (founded 1847). Its goals are to protect the interests of American physicians, advance public health, and…
(Encyclopedia) Nadelman, ElieNadelman, Elieāˈlē nädˈəlmən [key], 1882–1946, Polish-American sculptor, b. Warsaw. He spent some time in Paris and is said to have influenced Picasso. Before he settled…
Thank God, the Ground Broke My Fall!Theories of the UniverseCracks in a Newtonian WorldFaster Than a Speeding Light WaveIt All Depends on Your PositionThe Relative Nature of Space and TimeGeological…
(Encyclopedia) initiation, the transition and attendant ceremonies, such as ordeals and rites, involved in passing from one state or status to another, often from childhood to adulthood. It was among…
(Encyclopedia) hydrocephalushydrocephalushīˌdrəsĕfˈələs [key], also known as water on the brain, developmental (congenital) or acquired condition in which there is an abnormal accumulation of body…
(Encyclopedia) Kirkwood gaps, regions in the asteroid belt within which few asteroids are found. Astronomer Daniel Kirkwood first observed (1886) that few asteroids had an orbital period close to 1…
(Encyclopedia) Block, Adriaen, fl. 1610–24, Dutch navigator. Eager to establish a fur trade with the Native Americans, Amsterdam merchants sent (1613) Block and another Dutch navigator to explore the…
