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Spectral Classes for Main Sequence Stars (table)

(Encyclopedia)Characteristics of Spectral Classes for Main Sequence Stars ...

Wolf Trap National Park for the Performing Arts

(Encyclopedia)Wolf Trap National Park for the Performing Arts: see National Parks and Monuments (table)national parks and monuments (table). ...

Wuhan

(Encyclopedia)Wuhan wo͞o-hän [key], city (1994 est. pop. 3,519,600), capital of Hubei prov., central China, at the junction of the Han and Chang rivers. The great industrial, commercial, and transportation center...

track and field athletics

(Encyclopedia)track and field athletics or athletics, sports of foot racing, hurdling, jumping, vaulting, and throwing varied weights and objects. They are usually separated into two categories: track, the running ...

Ohio and Erie Canal

(Encyclopedia)Ohio and Erie Canal, former waterway of Ohio, 307 mi (494 km) long, between Lake Erie at Cleveland and the Ohio River at Portsmouth; built 1825–32. It utilized part of the courses of the Cuyahoga, M...

breast cancer

(Encyclopedia)breast cancer, cancer that originates in the breast. Breast cancer is the second leading cause of cancer death in women (following lung cancer). Although the vast majority of the cases occur in women,...

muscular dystrophy

(Encyclopedia)muscular dystrophy dĭsˈtrōfē [key], any of several inherited diseases characterized by progressive wasting of the skeletal muscles. There are five main forms of the disease. They are classified ac...

parvovirus

(Encyclopedia)parvovirus pärˌvōvīˈrəs [key], any of several small DNA viruses that cause several diseases in animals, including humans. In humans, parvoviruses cause fifth disease, or erythema infectiosum, an...

electric and magnetic units

(Encyclopedia)electric and magnetic units, units used to express the magnitudes of various quantities in electricity and magnetism. Three systems of such units, all based on the metric system, are commonly used. On...

information storage and retrieval

(Encyclopedia)information storage and retrieval, the systematic process of collecting and cataloging data so that they can be located and displayed on request. Computers and data processing techniques have made pos...