Everyone learns the number one rule about triangles in high school: the angles of a triangle add up to 180 degrees. But did you know that sometimes they don't? Triangles are much more interesting than ...

In our mind’s eye, the universe seems to go on forever. But using geometry we can explore a variety of three-dimensional shapes that offer alternatives to “ordinary” infinite space. When you gaze out ...

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What does connect-the-dots have to do with watching a Pixar film? More than you might think. A connect-the-dots page starts with nothing but some labelled points. As each dot is joined to the next, ...