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Featured Article: Polyhedron
In geometry, a polyhedron (plural polyhedra or polyhedrons) is often defined as a three-dimensional object with flat, polygonal faces and straight edges. In this sense, it is a three-dimensional example of the more general structure called a polytope, which can have any number of dimensions. Cubes, prisms, and pyramids are examples of polyhedra.
Popular Article: Autism spectrum
Autism, formally called autism spectrum disorder (ASD) or autism spectrum condition (ASC), is characterized by deficits in social communication and social interaction, and repetitive or restricted patterns of behaviors, interests, or activities, which can include hyper- and hyporeactivity to sensory input. Autism is clinically regarded as a spectrum disorder, meaning that it can manifest very differently in each person. Psychiatry has traditionally classified autism as a mental disorder, but the autism rights movement and an increasing number of researchers see autism as part of neurodiversity, the natural diversity in human thinking and experience, with strengths, differences, and weaknesses.
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