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Thoroughly revised and updated, this second edition continues to present both a theoretical and practical approach to motor development and adapted physical activity programs for preschoolers and infants with delays or disabilities. Written from a broad perspective, the authors use easy-to-understand language so that families, caregivers, students, and teachers may provide instruction utilizing the ecological dynamics of various environments. Chapter topics include: motor development, organization of the nervous system, muscle tone, medical and biological considerations (including prematurity and low birth weight, drug exposure, and autism spectrum disorders), assessment, principles of inter...
The mystery of the diffuse interstellar bands has been variously a curiosity, a co nundrum, and a nuisance for astronomers in the seven decades since the features were first noticed, but recently they have become a forefront issue in astrophysics. Ever since Paul Merrill, in a series of papers starting in 1934, pointed out the interstellar and unidentified nature of the bands, a Who's Who of twentieth century astronomers have tried their hands at solving the problem of identifying the carriers. Henry Norris Russell, Pol Swings, Otto Struve, Paul Ledoux, W. W. Morgan, Walter Adams, Jesse Greenstein, Lawrence Aller, and Gerhard Herzberg all briefly entered the stage, only to move on quickly to...
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