The periodic table - AQA Mendeleev made an early periodic table. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic structures model how ...

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Let the Rapping Unicorn's fun song and movement routine teach your class the 9 times table, while encouraging them to be physically active. This is a great introduction or refresher for students ...

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Cold urticaria is often idiopathic but can be secondary to another condition, including lymphoproliferative disease, auto-inflammatory disease (ie, cryopyrin-associated periodic syndrome), and ...

Gabriel Orozco discusses his artworks that play on various types of games, and how those works relate to underlying theoretical concepts. ART21: Ping Pond Table—where did the idea for that work come ...

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