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The spectrum in a rainbow. A spectrum (pl.: spectra or spectrums) [1] is a condition that is not limited to a specific set of values but can vary, without gaps, across a continuum. The word spectrum was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism.
A diagram of the electromagnetic spectrum, showing various properties across the range of frequencies and wavelengths. The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band.
The American psychiatrists Sally J. Rogers and Geraldine Dawson began developing the Early Start Denver Model during the 1980s. [1] While working at the University of Colorado, in Denver, Rogers provided what was first called the "play school model" of intervention which was applied to children in preschool during their regular play activities. [2]
Workbooks are paperback textbooks issued to students. [1] [2] [3] Workbooks are usually filled with practice problems, with empty space so that the answers can be written directly in the book. More recently, electronic workbooks have permitted interactive and customized learning. Such workbooks may be used on computers, laptops, PDAs, and may ...
She was the creative director for Free Realms, a massively multiplayer virtual world for teens and tweens. In 2010, she was recognized by Massive Online Gaming as one of the most influential people in MMOs, [2] sharing the #1 slot with Sony Online president John Smedley. Citing her role as spokesperson for Free Realms in addition to designer ...