Two-dimensional (2D) shapes are completely flat. They cannot be picked up. A polygon is a 2D shape with straight sides that meet at vertices. Polygons have names that show the number of sides they ...

David Attenborough has it all wrong. The natural world doesn’t coexist – it hates one another. Team Mammals despises Team Birds, and they have to be separated by large concrete blocks. We know this ...

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Priya Chandrashaker and her daughter sort objects by attributes. Priya Chandrashaker and her daughter show how to sort objects into groups based on attributes -- the characteristics of objects. She ...

In pre-kindergarten, children ages 3-5 develop a basic understanding of numbers and counting, and connect both to the idea of “how many.” Pre-k math tips work on recognizing, grouping, and comparing ...