Several years ago, I tried to explain infinity to a class of fifth graders. In the story that I told them, I was preparing to eat a piece of cake when a friend walked in on me. Being polite, I ...

She is also female. Weird, right? When people told her women were biologically unsuited to math, she used to draw a graph for them on the back of a napkin showing why this wasn’t statistically true.

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Math Notes understands the full set of trigonometry functions too, so you can use "sin," "cos," and "tan" in your expressions as well. On the iPhone and the iPad, you're able to build graphs from ...