Vitiligo is a common pigment disorder characterized by acquired loss of function or absence of melanocytes, leading to distinct areas of depigmentation. Physical exam reveals sharply demarcated, depigmented macules or patches on otherwise normal skin. Vitiligo can present at any age, in any skin color. There is no specific serologic marker for diagnosis, but patients often have other autoimmune...

Abstract Scalar fields have had a long and controversial life in gravity theories, having progressed through many deaths and resurrections. The first scientific gravity theory, Newton’s, was that of a scalar potential field, so it was natural for Einstein and others to consider the possibility of incorporating gravity into special relativity as a scalar theory. This effort, though fruitless in ...

This chapter presents an argument in favor of using paper to conceive, plan, and describe instructional design projects. Such a simple medium has great capability and, as is well known, a tenacious ubiquity; our offices, practices, and lives are filled with paper. We will see how the attributes of paper help us in both social and cognitive ways, particularly as a medium for drawing.