You can make a line graph in Excel in a matter of seconds using data already entered into the spreadsheet.

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Staring at gray grids all day? Same here—until I learned a one-step visual hack for Excel. It’s fast, doesn’t need fancy add-ons, and instantly makes data clearer and more fun to work with. There's a ...

A recent advance in geometry makes heavy use of Ramsey’s theorem, an important idea in another field — graph theory. Ramsey’s theorem states that in any graph where all points are connected by either ...

Forbes contributors publish independent expert analyses and insights. I help people communicate data clearly with graphs. This article is more than 10 years old. This is the first post in a new blog ...