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A further case of Down's syndrome with additional XYY aneuploidy is reported. The child has been followed for 5 years. It has not been possible to recognise any phenotypical feature which distinguishes the patient from others with Down's syndrome.
The nature of energy is not typically an explicit topic of physics instruction. Nonetheless, verbal and graphical representations of energy articulate models in which energy is conceptualized as a quasimaterial substance, a stimulus, or a vertical location. We argue that a substance ontology for energy is particularly productive in developing understanding… (More)